Question

two bodies of masses 1 kg and 1kg respectively moving in opposite direction to each other at speed of 5 m/s collide. what would be the speed of the two objects after the collision if they stick to each other?

Answer 1

the speed of the two bodies would be zero because two of the bodies at the same speed 5 metre per second so they completely resist each other's motion and motion of the body is will stop and they will remain in rest position

Answer 2

Hi friend here is your answer.

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m1v1-m2v2=(m1+m2)V

(I assumed from left to right to be positive.
So another one is moving from right to left hence negative.)

So, V= (1×5-1×5)/(1+1)

V=0/2=0 m/s ans.

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