Question

A body is projected horizontally with velocity $196m/s$ from height $400m$. What is the time to reach the ground?

• A. 5 s
• B. 9 s
• C. 15 s
• D. 20 s

Answer 1

Answer: (B)

Time to reach the ground is given by
$t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 400}{10}}$
$=4\sqrt{5}=9s$