(adsbygoogle = window.adsbygoogle || []).push({}); A ball weighing .2kg is traveling 20ms-^{1}to the left, a 20 000kg truck is traveling 25ms-^{1}to the right. What is the speed of the ball after the collision

(M_{1}V_{1}) + (M_{2}V_{2})_{before}=(M_{1}V_{1}) + (M_{2}V_{2})_{after}

This seemed so obvious, but i keep getting it wrong. The answer is 70ms-Thanks for the help in advance.^{1}. The only thing that i could be doing wrong is assuming the change in speed of the truck is negligible.

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

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

# Homework Help: Momentum before and after

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