Question

The ball of mass 0.5kg is dropped some certain height as it fall through 2mts. the kinetic energy acquired by it is.
1. 9.8J
2.980J
3.1J
4.4.9J

Answer 1

Answer:

If v is the velocity when it hits the ground, the average velocity is v/2.

Velocity increases by an amount g in Every second

Time to attain the velocity v is therefore v/g.

Distance traveled is average velocity*time

Hence 5m = (v/2)*(v/g)

Using g = 10 m/s^2 , find v.

v = 10m/s.