Thread: How do I solve this

A 3-kg particle has a velocity of (3i - 4j) m/s. Find the magnitude of its momentum.

Originally Posted by jaycas21

A 3-kg particle has a velocity of (3i - 4j) m/s. Find the magnitude of its momentum.

Momentum:



so:



RonL

Yes I got that too but the answer are as follows:

9 kg.m/s

-12 kg.m/s

15 kg.m/s

3 kg.m/s

Originally Posted by jaycas21

Yes I got that too but the answer are as follows:

9 kg.m/s

-12 kg.m/s

15 kg.m/s

3 kg.m/s

If you look carefully at CaptainBlack's work you will see that he simply forgot to multiply by m. His answer is the magnitude of the velocity, so the answer is 3*5 kg m/s = 15 kg m/s.

-Dan