• # question_answer A body is thrown horizontally from the top of a tower of height 5 m. It touches the ground at a distance of 10m from the foot of the tower. The initial velocity of the body is$(g=10\text{ }m/{{s}^{2}})$ A) 2.5 m/s             B)      5 m/s    C)      10 m/s               D)      20 m/s

Invoking $S=ut+\frac{1}{2}a{{t}^{2}}$in the vertical direction $-S=-\frac{1}{2}\times 10{{t}^{2}}\Rightarrow t=1\,s$ Along the $x-$axis $10=u\times t$ or, $u=\frac{10}{t}=\frac{10}{1}=10\,m/s.$ Hence, the correction option is (c).