Puck 1 (0.5 kg) travels with velocity 40 m/s to the right when it collides with puck 2 (1 kg) which is initially at rest. After the collision, puck 1 moves with a velocity of 0 m/s. Assume that no external forces are present and therefore the momentum for the system of pucks is conserved. What is the final velocity (in m/s) of puck 2 after the collision

The final velocity of puck 2 after the collision is 20 m/s .

Explanation:

Let us assume , right direction is positive and left direction is negative .

Given :

Mass of puck 1 and 2 of 0.5 kg and 1 kg respectively .

Initial velocity of puck  1 is 40 m/s .

Initial velocity of puck  2 is 0 m/s .

Final velocity of puck  1 is 0 m/s .

Let , us assume final velocity of puck 2 is .

Therefore , by conservation of momentum :

Therefore , the final velocity (in m/s) of puck 2 after the collision is 20 m/s .

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explanation: