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:

Question

a) height of the cliff

b) final vertical velocity

c) range

Answer 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