Question

A 2kg mass moving on a smooth frictionless surface with a a velocity of 10ms hits another 2kg mass kept at rest,in an inelastic collision. After collision,if THEY move together,then what is the their VELOCITY when they travel in the SAME DIRECTION?
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Answer 1

Vfinal= [m1v1(initial)+ m2v2(initial)]/M1+M2

Vfinal= 20/2+2

hence Vfinal equals 5 m/s

Answer 2

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Answer -

The 2 kg mass must be still moving as the floor is frictionless.

Frictionless also means there's no air.

No air, no atmosphere.

No atmosphere, no life.

What a sad place that is.

A lonely 2 kg mass roaming around endlessly and aimlessly till the end of the world.

Let us all pray for the poor soul of the hopeless 2 kg mass.

May the poor soul find peace of mind and live a happy hopeless aimless endless eventless lifeless life.