A low$-$friction track is set up with a spring on the right end. In the middle of the track, a $2\mathrm{.}3-kg$ cart moving to the right at $5\mathrm{.}0\frac{m}{s}$ overtakes a $3\mathrm{.}4-kg$ cart moving to the right at $2\mathrm{.}0\frac{m}{s}.$ After the collision, the $2\mathrm{.}3-kg$ cart is moving at $1\mathrm{.}7\frac{m}{s}.$

Part A

What is the coefficient of restitution of the collision?

$e=0\mathrm{.}84$

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Correct

Part B

How much energy is stored in the spring when it is at its maximum compression after the collision?

Express your answer with the appropriate units.

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