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in Work, Energy and Power by (34.7k points)
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A block of mass 2m moving with a velocity of v collides with a block of mass 4 m, which is at rest. After collision first block comes into rest. Find out the value of the coefficient of restitution.

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Given; m1 = 2m, u1 = u; m2 = 4m;
u= v= k u2 = ?; e=?
According to principle of conservation of momentum,

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