Question

A student drops a rock from a bridge to the water 12.7 m below. with what speed does the rock strike the water? the acceleration of gravity is 9.8 m/s 2

Answer 1

The rock strike the water with the speed of 15.78 m/sec.

The speed by which rock hit the water is calculated by the formula

v=
`√(2gh)`

v=
`√(2*9.8*12.7)`

v=15.78 m/sec

Hence, the rock strike the water with the speed of 15.78 m/sec.