Question

A ball of $0.5kg$ collided with wall at ${30}^o$ and bounced back elastically. The speed of ball was $12m/s$. The contract remained for $1sec$. What is the force applied by wall on ball:

• A. $12\sqrt{3}N$
• B. $6\sqrt{3}N$
• C. $3\sqrt{3}N$
• D. $\sqrt{3}N$

Answer 1

Answer: (B)

$6\sqrt{3}N$

$F=\frac{\Delta P}{\Delta t}$
$F=\frac{2mV\cos \theta }{\Delta t}$
$F=\frac{2\times 0.5\times 12\times \sqrt{3}}{2\times 1}$
$F=6\sqrt{3}$ Newton