Question

A ball is thrown vertically upwards from the top of a tower at 4.9 m/s. It strikes the pond near the base of the tower after 3 seconds. The height of the tower is

• A. 73.5 m
• B. 44.1 m
• C. 29.4 m
• D. None of these

Answer 1

The correct option is C 29.4 m

-h=ut-$\frac{1}{2}g{t}^2$,t=3 sec, u=4.9 m/s
$\Rightarrow$ h=-4.9$\times$3+4.9$\times$9=29.4 m