Question

A body thrown vertically upwards reaches the highest point in $2s$. Initial velocity of projection is_____

• A. 9.8 $m{s}^{-1}$
• B. 19.6 $m{s}^{-1}$
• C. 29.4 $m{s}^{-1}$
• D. 39.2 $m{s}^{-1}$

Answer 1

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

$v=u+at;a=-g$
$v=u-gt$
$v=0,u=gt$
$u=9.8\times 2=19.6m/s$