Question

A student drops an object of mass 10 kg from a height of 5 m. What is the velocity of the object when it hits the ground? Assume, for the purpose of this question, that $g=10m/s^2$.

Answer 1

Given : $S=h=5$ m $m=10kg$ $a=g=+10m/s^2$

Initial velocity of the object $u=0$ m/s (Taking downward direction to be positive)

Using $v^2-u^2=2aS$

$\therefore$ $v^2-0=2\times 10\times 5$ $⟹v=10$ m/s