A ball of mass 0.2 kg rests on a vertical post of height 5 m. A bullet
of mass 0.01 kg, traveling with a velocity V m/s in a horizontal
direction, hits the centre of the ball. After the collision, the ball and
bullet travel independently. The ball hits the ground at a distance of
20 m and the bullet at a distance of 100 m from the foot of the post.
The velocity V of the bullet is A) 250 m/s (B) 250 sqrt2 m/s
(C) 400 m/s (D) 500 m/s