# Particles (i+j)

• Nov 13th 2008, 11:21 AM
andythefox
Particles (i+j)
Hey I have got to do some mechanics questions for monday and i am struggling with a few.

This is one of them:

The velocities of two particles A and B are (pi-7j)m/s and (5i+qj)m/s respectively. The velocity of A relative to B is (2i-3j)m/s.

FInd the values of p and q.

Any help would be much appreciated.
• Nov 13th 2008, 01:24 PM
AshleyT
Quote:

Originally Posted by andythefox
Hey I have got to do some mechanics questions for monday and i am struggling with a few.

This is one of them:

The velocities of two particles A and B are (pi-7j)m/s and (5i+qj)m/s respectively. The velocity of A relative to B is (2i-3j)m/s.

FInd the values of p and q.

Any help would be much appreciated.

I'm not too sure, I've not done mechanics for a good few months (if you have the answers in the back of your book you could check this answer)

p + 5 = 2
Therefore p = -3
-7 + q = -3
Therefore q = 4.

If you have till monday i recommend asking your teacher tomorrow :) (friday)