A 0.21-kg apple falls from a tree to the ground, 4.0 m below. Ignoring air resistance, determine the apple s kinetic energy, K, the gravitational potential energy of the system, U, and the total mechanical energy of the system, E, when the apple s height above the ground is
(a) 4.0 m,
(b) 3.0 m,
(c) 2.0 m, (d) 1.0 m,
(e) 0 m. Take ground level to be y = 0.
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