First slide

Second law

Question

A body of mass 3 kg hits a wall at an angle of 60° and returns at the same angle. The impact time was 0.2 s. Calculate the force exerted on the wall :

Easy

A

$150 \sqrt{3} N$
B

$50 \sqrt{3} N$
C

100 N
D

$75 \sqrt{3} N$

Solution

$F = \frac{Δp}{Δt} = \frac{2 mvcos 30^{\circ}}{Δt} = \frac{2 \times 3 \times 10 \times \sqrt{3} / 2}{0 .2} = 150 \sqrt{3} N$

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