The figure shows the velocity as a function of the time for an object with mass 10kg being pushed along a frictionless horizontal surface by external horizontal force. At t =3s, the force stops pushing and the object moves freely. It then collides head on and sticks to another object of mass 25kg.

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Before Collision both bodies are moving in the same direction.

Speed of the 2^nd particle just before the collision is 1m/s.

External force acting on the block of mass 10kg is 50N from t=0 to t=3 sec.

Before Collision, bodies are moving in opposite direction.

answer is A, B, C.

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