Question

A ball is thrown from the top of a building of height 25 m with an initial velocity of 15 m/sec. If the height of the ball h from ground at any point of time t is given by $h=25+10t-3t^2$. The time taken by the ball to reach the ground is

• A. 15 sec
• B. 10 sec
• C. 5 sec
• D. $\frac{5}{3}\ \text{sec}$

Answer 1

Answer: (C)

5 sec

Answer 2

The correct option is (C): 5 sec