Item 1 V PartA Asports car accelerates from rest to 97 km/ h in 4.0 s . What is its average acceleration in m/s2. Express your answer using two significant figures. Item2 I Review | Constants V PartA Mary and Sally are in a foot race (see the figure). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at 6 Express your answer to two significant figures and include the appropriate units. constant rate of 0.44 111/32 to the finish line. (59%) . EM h r' O ? a = Value Units Muest Answer What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Item 3 Part A A car slows down from 30 m/s to rest in a distance of 77 m . What was its acceleration, assumed constant? Express your answer using two significant figures. VO AEQ ? a= m/s2 Submit Request AnswerItem 4 V Part A A car accelerates from 13 m/s to 22 m/s in 6.5 5 What was its acceleration assuming it is constant? Express your answer using two significant figures. Imp-\""0? nest Answer V PartB How far did it travel in this time? Express your answer using two significant figures. Muest Answer Item 5 V Part A Estimate how long it took King Kong to fall straight down from the top of the building (394 m high). Express your answer to three significant figures and include the appropriate units. LA t= Value Units Submit Request Answer Part B Estimate his speed just before "landing." Express your answer to three significant figures and include the appropriate units. HA ? V = Value Units Submit Request AnswerItem 6 V Part A A world-class sprinter can reach a top speed (of about 11.2 m/s ) in the first 20.0 m of a race. What is the average acceleration of this sprinter? Express your answer with the appropriate units. HA ? a = Value Units Submit Request Answer V Part B How long does it take her to reach that speed? Express your answer with the appropriate units. uA ? t = Value Units Submit Request AnswerItem 7 V Part A You are driving home from school steadily at 91 km/h for 170 km . It then begins to rain and you slow to 65 km/h instantly. You arrive home after How far is your hometown from school? driving 5.0 hours. Express your answer using two significant figures. AEQ ? d = km Submit Request Answer Part B What was your average speed? Express your answer using two significant figures. IVO AEQ ? v = km/h Submit Request AnswerItem 8 V PartA A car traveling 86 km/h is 200 m behind a truck "ave'mg 74 km/h ' How long will it take the car to reach the truck? Express your answer using two significant figures. Item 9 A sports car moving at constant velocity travels 110 m in 5.0 s . Item 10 V PartA In coming to a stop, a car leaves skid marks 81 In Ion on the hi hwa . g g y Assuming a deceleration of 4.30 m/s2 , estimate the speed of the car just before braking. Express your answer using two significant figures. Muest Answer Item 11 11 of 11 Review | Constants V Part A Calculate the average speed of a complete round trip in which the outgoing 300 km is covered at 96 km/h , followed by a 1.0-h lunch break, and the return 300 km is covered at 52 km/h . Express your answer to two significant figures and include the appropriate units. HA d ? V = Value Units Submit Request Answer Part B Calculate the average velocity of the trip. Express your answer to two significant figures and include the appropriate units. HA ? V = Value Units