Velocity After Collision(adsbygoogle = window.adsbygoogle || []).push({});

Hello everyone!

I am new to these forums, and it looks like they are a great place to learn and ask questions!!! I have been given an assignment to do and there are a few questions that I can't get, if anyone could help me I would really appreciate their efforts. Oh, and sorry for posting in the wrong forum the first time!

#1

(A) A 15.0 kg object is moving east at a velocity of 7.0 m/s when it collides with a 10.0 kg stationary object. After collision the 15.0 kg object is travelling at a velocity of 4.2 m/s at 340 degrees. What is the velocity of the 10.0 kg object after the collision?

I listed all of my givens but still can't seem to find an answer. By the way the answer to the question is 5.1 m/s at 25 degrees.

(B) Is this an elastic or inelastic collsion. Provide mathematical evidence for your answer.

I know that this is an inelastic collision because the kinetic energy will change and be lost as heat, sound, and light energy. But how do I prove it mathematically? The answer is 1.1 x 10^2 J . I was going to use the equation Ek= (1/2)m(v^2), but as I can't figure out part A it isn't helping me much.

If anyone can help me I would really appreciate it the effort!

**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!

# Velocity After Collision #2

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