Question

an object takes 5s to reach the ground from a height of 5 m on a planet . What is the value of g on the planet

Answer 1

We will use the equation of motions. :

THE EQUATION TO USE :

S =ut + 1/2gt²

Where S is the displacement, t the time u the initial velocity, g the acceleration due to gravity:


In this question:

u = 0

S= 5m

t = 5

Substituting in the formula we have :

5 = 1/2 × 25 × g

5 = 12.5g

g = 0.4 m/s²