Question

A puck, seen from the above, was moving with an initial momentum when it is received an impulse J from a hockey stick, giving it the final momentum shown. Using the ideas of figure 9.7, which arrows best represents the puck's initial momentum?

Answer 1

The final velocity of the blue hockey puck is 0 m/s after colliding with the motionless red puck and transferring its velocity to it, under the principle of conservation of momentum.

Step-by-step explanation:

The student is inquiring about the final velocity of a blue hockey puck after it collides with a red puck on an ice surface. Given that the red puck was initially motionless and the blue puck was moving at 2.5 m/s, and after the collision the red puck moves at 2.5 m/s, we can assume that the mass of the pucks is conserved and, since the red puck took all the initial velocity of the blue puck, the final velocity of the blue puck will be 0 m/s if no external forces are acting on the system and the collision is perfectly inelastic. This follows from conservation of momentum, which is a principle stating that the total momentum of a closed system remains constant if no external forces are acting upon it.