Two identical balls, each with velocity v, strike each other at right angles to each other. They stick together. Ignoring friction, (a) describe the motion of the combined ball after the collision and (b) describe the motion of the centre of mass of the two balls before and after the collision.(adsbygoogle = window.adsbygoogle || []).push({});

Not quite sure how to do this but here is what I came up with:

a. If they hit at right angles and stick to each other the will travel in a 45 degree angle from the position of contact? Is this correct?

b. The centre of mass of the each ball will be a straight line prior to contact and a straight line after the collision. Is this correct?

Thanks for the help

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Momentum and centre of mass

**Physics Forums | Science Articles, Homework Help, Discussion**