Question

Ball $A$ of mass $1kg$ moving right with speed $2m/s$ bounces off ball $B$ of mass $1.5kg$ , and then moves left with speed $4m/s$ .
Calculate magnitude of impulse (SI units) received by ball $B$.

Answer 1

Impulse is the change in momentum. So, the magnitude of impulse received by ball B will be,

$I=m_A\Delta v$

$=1\times \left\{2-\left(-4\right)\right\}$

$=6kgm/s$