Question

A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground.
Assume acceleration due to gravity $g=10m/s^2$.

• A. 40 m/s
• B. 50 m/s
• C. 20 m/s
• D. can't be evaluated

Answer 1

The correct option is C

20 m/s

Given,
Height $s=20m$
Initial velocity $u=0$
Since, the acceleration is along the direction of motion, $a=g=+10m/s^2$
Final velocity $v$ can be obtained from
$v^2=u^2+2as$
$v^2=0+2\times 10\times 20=400$
$v=\sqrt{400}=20m/s$​