A ball of mass 500 grams moving towards the right with a speed of \( 4 \mathrm{~ms}^{-1} \) collides with a 300 grams ball at rest. The collision is perfectly elastic. Determine the velocity of each ball after collision.
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A 50 g ball moving to the right at $4.0 \mathrm{m} / \mathrm{s}$ overtakes and collides with a $100 \mathrm{g}$ ball moving to the right at $2.0 \mathrm{m} / \mathrm{s} .$ The collision is perfectly elastic. Use reference frames and the Chapter 10 result for perfectly elastic collisions to find the speed and direction of each ball after the collision.
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