11. A car starts at rest and after 9.20 seconds is travelling at 25.0 m/s. How far will it have travelled during this trip? Show all work as demonstrated in the lessons. 12. A cross-country race car driver sets out on a 1.00 hour, 100.0 km race. At the halfway marker (50.0 km), the pit crew radios that the car had averaged a speed of only 80.0 km/h. a) How long did it take the driver to travel the first 50.0 km? Show all work as demonstrated in the lessons. b) How fast must the driver drive over the remaining distance in order to average 100.0 km/h for the entire race? Show all work as demonstrated in the lessons. 13. A car starts at rest and is moving at a velocity of 25.0 m/s after 18.0 seconds. How far will it have traveled? Show all work as demonstrated in the lessons. 14. A cat's displacement is 15 meters to the right in 7.0 seconds. If, at the start of the 7.0 seconds, the cat was moving at a velocity of 2.0 m/s left what was its final velocity? Show all work as demonstrated in the lessons.Answers: Intro to Kinematics: 1) magnitude, magnitude, direction 2) straight line 3) Less 4) V: displacement, force, 20m/s[N], velocity, 50m[down], 9.8m/s2[down], acceleration, 10km[SW] S: 1kg, 10km/hr, distance, 200km, 5hours, 40L, mass, speed 7) change 8) 10,0,15,-5,-10,5 9)1km[N] 10)0.5m[S] 11)+3.5m 12)58m[31 WofN] or 58m[59 NofW] 13)600.km, 447[27 WofN] Velocity 4)2.7m/s[E] 5)91[W] 6)30.s 8)21m/s 9)70km/h 10)35km/h,9.6m/s 11)40.km[E] 12)+5m, +2m/s Graphing Motion: Ba) no, y-intercepts are different b) B c) A d) A has a steeper slope e) A and B are at the same position 4)2.5s,5s,20m, 10m,4m/s,2m/s 5) a) Os,32s,55s b) 15-20s c) 20-40s d) 4m/s, 5m/s e) 3m/s f)0, 3.6m/s 6. The ball doesn't move at first. Then it moves backwards and then finally stops. position thiri 7 . Time (al 8. Timeis 9. Acceleration: 5)m, s, m/s, m/s2 6)11m/s 7)7m/s 8)4.0s 12)0.82s 14)23m/s[down] 15) pos, neg, neg, pos, pos 17) a)pos, inc, pos b) neg, dec, neg c) pos, dec, neg d) neg, inc, pos 18) velocity, velocity Graphing with Acceleration: 5)12.5m/s2 6/7)parabola, linear 8)a)perhaps at 0 minutes b)0,30,55min c)30-55min d)60m/min,6m/min2 9)50m 10)50m Problem Solving 1) 77.5 m/s2 2) a=0.278m/s2 3) 1.44x105 m 4) 80.s 5)2470m 6)0.87m/s2 [opposite] 7)2.9 s 8)80s 9)1.65s 10)53.3km/h or 14.8m/s 11)115m 12)0.625h, 133km/h 13) 225m 14) 6.3m/s[right] 15)0.46m/s2 16)59m/s[down] 17)5.0m/s2 18)4.0m/s 19)250m 20)0.94m/s 21)2x105 m/s2 22)30.6m/s 23)5.0m/s15. A bus traveling at 80.0 km/h accelerates for 12 s to a speed of 100. km/h. What was the acceleration? Show all work as demonstrated in the lessons. 16. A small stone is dropped and spends 6.0 seconds in the air until it strikes the ground. What speed is it moving when it reaches the ground? Show all work as demonstrated in the lessons. 17. A cyclist, starting from rest, achieves a speed of 15 m/s after traveling 22.5 m. What was the acceleration? Show all work as demonstrated in the lessons. 18. A child on a toboggan slides down a snowy hill, accelerating uniformly at 2.8 m/s2. When the toboggan passes the first observer, it is travelling with a speed of 1.4 m/s. How fast will it be moving when it passes a second observer, who is 2.5 m downhill from the first observer? Show all work as demonstrated in the lessons. 19. A formula 1 race car travelling at 100. m/s can decelerate at 20. m/s2. How far in advance must the brakes be applied to come to a stop?6. A satellite in space is travelling at 14 m/s in one direction. A thruster is applied for 30. s and the satellite is then travelling at 12 m/s in the opposite direction. What acceleration does the thrust cause? Show all work as demonstrated in the lessons. 7. A rock is dropped off a 40. meter cliff. The rock accelerates due to gravity. What is the time it takes to hit the ground? Show all work as demonstrated in the lessons. 8. A motorcycle is travelling at a constant velocity of 90 km/h (no acceleration). How many seconds will it take the motorcycle to cover 2 km? Show all work as demonstrated in the lessons. 9. Hikers at the bottom of a canyon are facing towards the canyon wall 280.5 meters away. Given that the speed of sound in air is 340. m/s, how long after they shout will they hear their echo? Show all work as demonstrated in the lessons. 10. A woman makes a daytrip to a beach that is located 40.0 km from her home. On the trip to the beach, she averages a speed of 80.0 km/h but gets a speeding ticket upon her arrival. On the return trip, she averages just 40.0 km/h. What was her average speed for the entire trip? Show all work as demonstrated in the lessons.20.A bike rider accelerates constantly to a velocity of T.5 mls during 4.5 s. The bike's distance is 19m. What is the initial velocity of the bike? 21. If a bullet leaves the muzzle of a rifle with a speed of 600 mls, and the barrel of the rifle is 0.9 m long, what is the acceleration of the bullet while in the barrel? 22. Randy Johnson hits a baseball straight into the air, giving it a \"hang-time\" of 6.25 5. Determine the initial velocity of the ball. 23. If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed