Moments and Newton's Laws - A Level Physics Exam Practice Question - Calculation Question

[@praseansubba7844]

2:35 What a legend you are! and thank you very understanding way of teaching sir.

[@MK-oj6hd]

I wanted to share my favourite question on momentum so far. I'm curious as to how you would tackle it. On a linear air track, a mass of 120g is travelling to the right with a velocity of 83 cm s-1. It collides elastically with a mass of 200g travelling with velocity 47cm s-1 in the opposite direction. With what velocity do the masses travel after the collision? (4 marks)

[@KitBetts-Masters]

+Darth Vader 4.7cm/s to the right?

[@MK-oj6hd]

Hi GP. That's not the correct answer I'm afraid. This is a rather difficult problem and it took me a while to get my head around it. Shall I give the solution or would you like to think about it a bit more?

[@KitBetts-Masters]

Ah it's because I need to use energy as you've told me elastically right?

[@MK-oj6hd]

Yep, the collision is elastic ;)

[@Asma-hu8ih]

Is it 0.117 to 3 significant figures?

[@AmarT097]

Great videos, helped me out thank you

[@KitBetts-Masters]

AmarT097 really glad! share it out please and check out the rest of the playlist! 😀

[@AmarT097]

Will do, thanks a lot