On a frictionless horizontal air table, puck A (with mass 0.366 kg) is moving toward puck B (with mass 0.254 kg ), which is initially at rest. After the collision, puck A has velocity 0.119 m/s to the left, and puck B has velocity 0.655 m/s to the right.(adsbygoogle = window.adsbygoogle || []).push({});

What was the speed of puck A (Vai) before the collision?

K I put v=v1(m1+m2)/(m1-m2)

v1=-.119 m/s since it moves in the left direction and i defined right as +ve

my initial velocity of puck a came to be -0.659 m/s, but it seems to be wrong.

Calculate , the change in the total kinetic energy of the system that occurs during the collision.

for the KE I got 0.333 J but I don't know why its wrong

thx guys

**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!

# Homework Help: Collisions in 1 dimension

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