a ball of mass 5kg is dropped from a height of 78.4m,the time taken by the ball to reach the ground is?

Answer 1

mass irrelevant

78.4 = (1/2) g t^2

t^2 = 2 * 78.4 / 9.81

Answer 2

S=0.5gt^2
78.5=0.5*10t^2
t=3.96 s

Answer 3

Note to Benson: Nowhere on this planet is the acceleration due to gravity 10m/s^2.

Answer 4

He has a Uranium mine.