So I'm confused on a question on June 2014 OCR M1 and the mark scheme doesn't help me. It says
Particles P and Q move towards each other with speeds 4m/s and 2m/s along a smooth surface. P has mass 0.2 and Q 0.3. They collide. Show that Q changes direction.
So I can do conservation of linear momentum but I can't figure out how you can know what direction a velocity is going without knowing its actual value. The mark scheme says the marks are as follows:
Calculation for both “before” Momentum (magnitudes)
Compares both terms without arithmetic error
Shows direction of after total momentum conflicts with the before velocity/momentum of Q
I don't understand how you can infer direction with two unknown 'after' velocities.
I have the equation
0.2 = 0.2V1 + 0.3V2
Can anyone explain it better than the mark scheme?
Direction of Particles M1
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