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Q.

A 3 kg ball strikes a heavy rigid will with a speed of 10 m/s at an angle of 60". It gets reflected with the same speed and angle as shown in fig. If the

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ball is in contact with the wall for0.20 s, what is the average force exerted on the ball by the wall ?

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a

zero

b

150√3 N

c

300 N

d

150 N

answer is C.

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Detailed Solution

We know that F=Δp/Δt

Here Î”p=2mvsin⁡θ=2×3×10sin⁡60∘ =60×(3/2)=303

Given that Î”t=0.2s

∴F=3030⋅2=1503.

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