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A body of mass m moving with velocity u collides head on elastically with another body of mass 2m at rest. What is the ratio of kinetic energy of the colliding body before and after collision ?

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The correct Answer is:
`9:1`
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AAKASH SERIES-COLLISIONS -NUMERICAL EXERCISE ( LEVEL 1)
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  2. A particle experiences a perfectly elastic collision with a stationary...

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  3. A neutron of mass 1.67Xx10^(-27) kg moving with a velocity 106 ms-. co...

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  4. AU^(238) nucleus emits an a-particle and it in turn converted into Th^...

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  5. Two balls each of mass 0.06 kg moving in opposite directions each with...

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  6. A ball of mass 0.4 kg moving with a uniform speed of 2 ms. strikes nor...

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  7. A sphere of mass 2 kg moving with a velocity of 40 ms^(-1) hits anoth...

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  8. A bullet of mass 5 g moving with a velocity of 300 ms strikes a plank ...

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  9. A sphere of mass 3 kg moving with a velocity of 2 ms- collides head-on...

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  10. A bomb at rest explodes into two pieces of masses 1 kg and 2 kg. If th...

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  11. A ball strikes the floor vertically and rebounds with a co-efficient o...

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  12. A solid sphere is moving and it makes an elastic collision with anothe...

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  13. A body of mass m moving with velocity u collides head on elastically w...

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  14. A moving particle of mass .m. makes head-on elastic collision with a p...

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  15. A ball of mass .m., moving with uniform speed, collides elastically wi...

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  16. A ball A, moving with kinetic energy E, makes a head on elastic collis...

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  17. An imperfectly elastic particle is projected with an initial velocity ...

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  18. A spherical imperfectly elastic ball strikes a plane with a velocity 8...

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