A 1000.-kilogram roller coaster goes down a hill that is 90. meters tall. Its speed at the bottom is 40. m/s.
a. What is the efficiency of the roller coaster? Assume it starts from rest at the top of the hill.
b. What do you think happens to the lost energy?
c. Use the concepts of energy and efficiency to explain why the first hill on a roller coaster is the tallest.

Steelhead trout migrate up stream to spawn.occasionally they need to leap up small waterfalls to continue their journey. fortunately, steelhead are remarkable jumpers, capable of leaving the water at a speed of 8.0 m/s. a. what is the maximum height a steelhead trout can jump? b.leaving the water at 8.0 m/s, the trout lands on top of the water fall 1.8 m high. how long was it in the air?