The track shown in the figure is frictionless. The block $B$ of mass $4 k g$ is lying at rest and block $A$ of mass $2 k g$ is pushed along the track with some speed. The collision between $A$ and $B$ is perfectly elastic. With what velocity should the block $A$ start such that block $B$ just reaches at point $P$ ?

10 m / s

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5 m / s

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20 m / s

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15 m / s

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Solution

The correct option is A $10 m / s$
Option A

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Q. The track shown is figure is frictionless. The block B of mass 2m is lying at rest and the block A or mass m is pushed along the track with some speed. The collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened?
Figure

The track shown in figure (9-E16) is frictionless. The block B of mass 2m is lying at rest and the block A of mass m is pushed along the track with some speed. the collision between A and B is perfectly elastic. With what velocity should the block A be started to get the sleeping man awakened ?

The track shown in figure is frictionless. The block $B$ of mass $2 m$ is lying at rest and the block $A$ of mass $m$ is pushed along the track with some speed. The collision between $A$ and $B$ is perfectly elastic. With what velocity should the block $A$ be started to get the sleeping man awakened?