Question

A ball is thrown vertically upwards from the top of a lower with a speed $100m/s$ . It strikes the pond near the base of the tower after $25second$ . The height of the tower is :

• A. $500m$
• B. $125m$
• C. $625m$
• D. $425m$

Answer 1

Answer: (C)

$625m$

The distance is given as,

$s=ut-\frac{1}{2}g{t}^2$

$s=100\times 25-\frac{1}{2}\times 10\times {\left(25\right)}^2$

$s=-625m$

The distance is negative because the final position of ball lies below the initial position.

Thus, the height of the tower is $625m$.