2) A 200-kg boulder is at rest 1000-m above the ground. a) What is its potential energy when it is 1000-m above the ground? GPE= m*g*h= b) What is its kinetic energy when it is 1000-m above the ground? c) The boulder begins to fall. What is its potential energy when it is 500-m above the ground? d) Where did the "lost" potential energy go? e) What is the kinetic energy of the boulder when it has fallen 500-m? f) What is the kinetic energy of the boulder just before it hits the ground? 3) A rollercoaster is designed as shown below. If the roller coaster starts at the top of the 1st hill from rest: a) Describe what will happen to the rollercoaster START