Question

How fast should a man of $50kg$ run so that his kinetic energy will be $625J$ ?

Answer 1

$Mass=50kg$
Kinetic energy $=625J$
$v=?$

Using the relation
:
$KE=\frac{1}{2}m{v}^2$

$625=\frac{1}{2}\times 50\times v^2$

$v=5m/s$