Question

What kinetic energy should be imparted to an object of mass “m” to raise it to a height of 1000 meters? (Take g = 10 m/s^2)

(a) 10m J

(b) 100m J

(c) 1000m J

(d) 10000m J

This question was addressed to me in final exam.

This intriguing question originated from Kinetic Energy in division Work, Energy and Power of Physics – Class 11

Answer 1

The correct option is (d) 10000m J

For explanation I would say: Mass of object = m

From the conservation of energy;

1/2 x m x v^2 = m x g x h

 = m x 10 x 1000

 = 10000m J