A stone dropped from the top of a 80m high building strikes the ground at 40 m/s after falling for 4 seconds. The stone's potential energy with respect to the ground is equal to its kinetic energy β¦ (use g = 10 m/s 2) Please explain how you got it so I can learn.
A) at the moment of impact.
B) 2 seconds after the stone is released.
C) after the stone has fallen 40 m.
D) when the stone is moving at 20 m/s.
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A stone dropped from the top of a 80m high building strikes the ground at 40 m/s after falling for 4...
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