A hockey puck with a mass of 0.18 kg travels at a velocity of 40 m/s toward a goalkeeper. The goalkeeper has a mass of 120 kg and is at rest. Assuming a closed system, find the total momentum of the goalkeeper and puck after the puck is caught by the goalkeeper.
7.2 kg.m/s
5.3 kg.m/s
6.4 kg.m/s
4,807 kg.m/s
To find the total momentum of the goalkeeper and puck after the puck is caught, we need to use the principle of conservation of momentum.
The initial momentum of the puck before it is caught is given by:
Initial momentum of puck = mass of puck * velocity of puck
Initial momentum of puck = 0.18 kg * 40 m/s
Initial momentum of puck = 7.2 kg.m/s
The initial momentum of the goalkeeper is 0, as the goalkeeper is at rest.
Since momentum is conserved in a closed system, the total momentum of the goalkeeper and puck after the puck is caught will be equal to the initial momentum of the puck:
Total momentum of goalkeeper and puck = 7.2 kg.m/s
Therefore, the correct answer is:
7.2 kg.m/s