2(1.50 kg)(9.80 m/s )(12.5 m) 184 JWmgh===.(b) The force of gravity is conservative, so the change in the potential energy of the snowball-Earth system is the negative of the work it does: ΔU= –W= –184 J. (c) The potential energy when it reaches the ground is less than the potential energy when it is fired by |ΔU|, so U= –184 J when the snowball hits the ground.
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