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A 4 . 0 kg block rests at the edge of a platform that is 2 0 m above level ground. The block is launched

4.0

kg block rests at the edge of a platform that is

20

m above level ground. The block is launched horizontally with an initial velocity of

15 \frac{}{} m/s.

Calculate the smooth granite rock's kinetic energy when it hits the ground ?

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