Question

If a rock has a speed of 12 m/s as it hits the ground, from what height did it

fall, assuming its initial speed was zero? Its mass is 50 kg.
A. 600 m
B. 4.2 m
C. 12 m
D. 7.3 m

Answer 1

To find the height the following formula should be used:

v 2 = u 2 + 2aH

Step-by-step explanation:

Assuming this occurs on earth, a= 9.8 ms -2

-2 2

12=0+2 x9.8 x H

144

_______ =H

2 x 9.8

H= 7.35m