What is the speed of the 0.272 kg ball after the collision

What is the speed of the 0.272 kg ball after the collision

What is the speed of the 0.272 kg ball after the collision

1. A ball of mass 0.544 kg is moving east with a speed of 3.90 m/s and collides head-on with a 0.272 kg ball at rest. Assume that the collision is perfectly elastic. After the collision, the 0.544 kg ball moves at 1.3 m/s. What is the speed of the 0.272 kg ball after the collision?2. A 0.300 kg hockey puck, moving east with a speed of 5.38 m/s, has a head-on collision with a 0.950 kg hockey puck that is initially at rest. Assume that the collision is perfectly elastic. After the collision, the 0.950 kg puck moves at 2.58 m/s to the east.What is the speed of the 0.300 kg hockey puck after the collision? Can anyone explain this to me? 🙁 I figured out all the other questions on the homework, but these have me stumped.

 

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