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Block A of a mass 0.7 kg is sliding to the right at a speed of...

Block A of a mass 0.7 kg is sliding to the right at a speed of 4.7 m/s while block B of mass 4.5kg is sliding to the right with a velocity of 1.2 m/s.

The surface is frictionless for both blocks. If they collide perfectly elastically what is the speed of block A after the collision?

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Answer #1

Given,
The mass of the body A is
Ans mass of the body B is:
Speed of body A before Collision:
speed of body B before collision:

Since the collision is perfectly elastic so it will follow the law of coservation of momentum.





............1


also the collision is perfectly elastic so it will follow the law of coservation of energy





.........................................................2
putting the value of from equation 1 in equation 2



solving this quadratic equation:



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