Question

A 4 kg object is dropped from a height of 30 meters. What is its speed just before it hits the ground?

Answer 1

Step-by-step explanation:

By Using 3rd Equation of motion

2as =
`Vf^(2) - Vi^(2)`

if we ignore air friction

a = 9.8 m/s2

s = 30 m

`Vi^(2)` = 0 m/s

we have to find

Vf = ?

By substituting values in above equation

Vf = 24.24 m/s