# A ball is thrown vertically upwards from top of tower at $4.9\;m/s$ . It strikes the base of the tower after 3 seconds. The height of tower .
$\begin{array}{1 1} (a) \;73.5\;m \\ (b) \;44.1\;m\\ (c) \;29.4\;m \\ (d) \;None\;of\;these \end{array}$