Question

A body of mass 5 kg falls from the rest from a height 10 metre from earth surface the kinetic energy of a body on the earth surface will be

Answer 1

Given

m = 5kg. , s = h = 10 m , u =0 , a= 9.8 m/s^2 = g

Solution

v^2 = u^2 + 2as

v^2 = 0 + 2 ×9.8 × 10

= 196 m/s

Velocity square = 196 m/s

Kinetic energy = 1/2 mv^2

Kinetic energy = 1/2 × 5 × 196

Therefore, Kinetic energy is 490 J.