First slide

Second law

Question

A 0.5 kg ball moving with a speed of 12 m/sec strikes a hard wall at an angle of $30^{0}$ with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 s, the average force acting on the wall is

Moderate

A

96 N
B

48 N
C

24 N
D

12 N

Solution

$F = \frac{2 m v \sin θ}{t} = \frac{2 \times 0.5 \times 12 \times \sin 30^{\circ}}{0.25} = 48 \times \frac{1}{2} = 24 N$

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