SICS I1 / 20 WCLN.ca 15. 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. the lessons. What speed is it moving when it reaches the ground? Show all work as demonstrated in 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