A ball of mass 200 g rests on a vertical post of height 20 m. A bullet of mass 10 g, travelling in horizontal direction, hits the centre of the ball.…

A ball of mass $\displaystyle 200$ g rests on a vertical post of height $\displaystyle 20$ m. A bullet of mass $\displaystyle 10$ g, travelling in horizontal direction, hits the centre of the ball. After collision both travels independently. The ball hits the ground at a distance $\displaystyle 30$ m and the bullet at a distance of $\displaystyle 120$ m from the foot of the post. The value of initial velocity of the bullet will be (if $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ ):