Question

A particle of mass m collides with another stationary particle of mass m. If the particle m stops just after collision, the coefficient of restitution is equal to

Answer 1

correct answer is:m/M

As net horizontal force acting on the system is zero, hence, momentum must remain conserved.

Hence,

mu+0=0+Mv2

v 2 = Mu/m

A sper defination, e=(v2-v1)/(u2-u1)=v2-0/u-0

v2/u=M/m

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