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lingling
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Homework Statement
A stone of mass 2 kg is projected horizontally with a speed of 20 m/s from a cliff which is 15 m above the ground. Find the energy possessed by the stone just before touching the ground.
A. 400J
B. 500J
C. 600J
D. 700J
Homework Equations
The Attempt at a Solution
I can't get the answer. How can I achieve it?
I think 'just before touching the ground' means when the stone is still moving, but I don't know the velocity at this instant. And at the same time, the stone is losing potential energy, how can I manage this?