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A ball of mass 5.0kg hits a smooth vertical wall normally with a speed...

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Question 325
A
20.0kg ms-1
B
10.0kg ms-1
C
5.0kg ms-1
D
1.3kg ms-1
E
0.0kg ms-1.
Explanation
Impulse = Ft = mu - (-mu)
= mu + mu = 2mu = 2 x 5 x 2 = 20kgms-1

Correct option: A

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