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A rock is thrown downward from the top of a 40.0-m-tall tower with an initial speed of 12 m/s. Assuming negligible air resistance what is the speed of the rock just before hitting the ground? (a) 28 m/s (b) 30 m/s (c) 56 m/s (d) 784 m/s (e) More information is needed.

Vertical Motion & Free Fall

Vertical Motion & Free Fall

Vertical Motion & Free Fall

Vertical Motion & Free Fall