A 20-kg rock that is initially at rest loses 407-j of
a 2.0-kg rock that is initially at rest loses 407-J of potential energy while falling to the ground. Calculate the kinetic energy that the rock gains while falling. What is the rock's speed just before hitting the ground.
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a 20-kg rock that is initially at rest loses 407-j of potential energy while falling to the ground calculate the
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