physics

A person kicks a rock off a cliff horizontally with a speed of 20 m/s. It takes 7.0 seconds to hit the ground, find:

a) height of the cliff

b) final vertical velocity

c) range

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  1. In the vertical, vi=0
    h=vi*t-1/2 g t^2
    h=0-4.9t^2
    h=4.9(49) meters

    vf=vi+gt
    vf=0+9.8*7 m/s

    range=horzveloctiy*timeinair
    =20*7 m

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