Q.(adsbygoogle = window.adsbygoogle || []).push({});

A 0.150 kg billiard ball (A) is rolling toward a stationary billiard ball (B) at 10.0 m/s. After the collision, ball A rolls off at 7.7 m/s at an andle of 40.0 degrees clockwise from its original direction. What is the speed and direction of Ball B after the collision?

Known:

M of A = .150 kg

M of B = .150 kg

Vi of B = 10.0 m/s

Vf of A = 7.7 m/s[70degrees clockwise]

Implied:

Vi of A = 0 m/s

Ff = 0N

Unknown:

Vi of B = ?

I started out using the law of conservation of energy but I messed up somewhere early and got fully lost...I know you need to use this method to conserve the momentum of each object but I just can't remember how, can someone start please?

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

Dismiss Notice

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!

# Question about collisions in 2-dimensions

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