Problem

A train is moving on a track at

30 \text{ ms}^{-1}

. A ball is thrown from it perpendicular to the direction of motion with

30 \text{ ms}^{-1}

45^\circ

from horizontal. Find the distance of ball from the point of projection on train to the point where it strikes the ground. a. 90 m b.

90\sqrt{3}

m c. 60 m d.

60\sqrt{3}