Question

An object falling freely from rest reaches ground in $2s$. If acceleration due to gravity is $9.8m{s}^{-2}$, the velocity of object on reaching the ground will be

• A. $9.8$ $m$ $s^{-1}$
• B. $4.9$ $m$ $s^{-1}$
• C. $19.6$ $m$ $s^{-1}$
• D. zero

Answer 1

The correct option is C $19.6$ $m$ $s^{-1}$

$v=u+gt$ , initially u$=$0 and g acting in the direction of movement of body.
$v=0+9.8\times 2$
$v=19.6m/s$