- #1
zaraox
- 7
- 0
A puck has a velocity of 3i –4j m/s and a mass of 20 kilograms. What is the momentum of the puck?
A. 100 Ns
B. 60i – 4j Ns
C. 60i – 80j Ns
D. 23i – 24j Ns
Alright, so I calculated the velocity from the resultant vector to be 5 m/s. So:
p = mv
p = 20 kg x 5 m/s
p = 100 Ns
But I can also do this:
p = mv
p = 20(3i - 4j)
p = 60i - 80j Ns
So what answer is right, A or C?
A. 100 Ns
B. 60i – 4j Ns
C. 60i – 80j Ns
D. 23i – 24j Ns
Alright, so I calculated the velocity from the resultant vector to be 5 m/s. So:
p = mv
p = 20 kg x 5 m/s
p = 100 Ns
But I can also do this:
p = mv
p = 20(3i - 4j)
p = 60i - 80j Ns
So what answer is right, A or C?