Question

A rock is dropped from a high bridge. At the end of 3 seconds of free fall the speed of the

rock is, in cm/sec²​

Answer 1

Explanation:

if a = -g

then

v = Vi - g t

h = Hi + Vi t - (1/2) g t^2

so

v = 0 - 9.81 * 3  

so speed which is |v| is about 30 m/s