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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 theball 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 N

c

150√3 N

d

300 N

answer is C.

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Detailed Solution

We know that F=Δp/ΔtHere Î”p=2mvsin⁡θ=2×3×10sin⁡60∘ =60×(3/2)=303Given that Î”t=0.2s∴F=3030⋅2=1503.
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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 theball is in contact with the wall for0.20 s, what is the average force exerted on the ball by the wall ?