JAMB - Physics (2014 - No. 10)
An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is
200J
4000J
2000J
500J
解释
Kinetic Energy = mgh
= 20 x 10 x 10 J
= 2000J
= 20 x 10 x 10 J
= 2000J