A proton is travelling to the right at 2.0 × 10^7  m s. It has a head-on perfectly elastic collision with a stationary carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What are the speed and direction of each after the collision?

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Chapter8: Momentum And Collisions
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A proton is travelling to the right at 2.0 × 10^7 
m s. It has a head-on perfectly elastic
collision with a stationary carbon atom. The mass of the carbon atom is 12 times the mass of the proton.
What are the speed and direction of each after the collision?

 An object at rest on a flat, horizontal surface explodes into two fragments, one with mass 100g, the other 700g. The heavier fragment slides 8.2m before stopping. How far does the lighter fragment slide? Assume both have the same coefficient of
kinetic friction.

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