A body is thrown horizontally from the top of a tower of 5 m height. It touches the ground at a distance of 10 m from the foot of the tower. The initial velocity of the body is:

Question

( A ) $5\; ms^{-1}$
( B ) $2.5 \; ms^{-1}$
( C ) $10\;ms^{-1}$
( D ) $20\; ms^{-1}$