Question

A $0.5kg$ ball moving with a speed of $12m/s$ strikes a hard wall and return back with same velocity. Find change in momentum.

• A. 12 kg m/s
• B. 20 kg m/s
• C. 22 kg m/s
• D. 120 kg m/s

Answer 1

The correct option is A 12 kg m/s

Change in momentum $=m({\overrightarrow{v}}_2-{\overrightarrow{v}}_1)$

$\Rightarrow \Delta p=0.5[12-(-12\left)\right]$

$\Rightarrow \Delta p=0.5\times 24=12kgm/s$