Question

A ball of mass 20g moving at horizontal speed of 20ms-1

Answer 1

$\bold{To\: find\: the\: momentum \:of\: ball}$
$\bold{P = Mass × velocity\: then\: from\:}$
$\bf{above}$
$P = 20/1000 × 20$
$=400/1000\\=0.4 \:kg\:meter/sec$

$\fbox{\bold{Hope\:it\:Helps}}$