Question

A rock is dropped off a cliff and strikes the ground with an impact velocity of 20m/s. How high was the cliff?(use a=-10m/s2)

Answer 1

20 m

Step-by-step explanation:

by the formula,

`2aS = V_(f)^(2) - V_(i)^2`

2 x 10 x S = 20^2 - 0

20S = 400

`S = (400)/(20)`

S = 20 m