Question

calculate the momentum of a ball of mass 4 gram moving with a speed of 120 kilometre per hour

Answer 1

$mass of ball = 4gm = 0.004kg$

$120km per \: hour \: = 33.333....m \: per \: sec$
$p = m {v}^{2}$
$= 0.004 \times 33.3333.. \\ = 0.132....kgm \: per \: sec$