Problem $9$: $(7\%$ of Assignment Value$)$

Suppose that a $110$ kg football player running at $7\mathrm{.}5\frac{m}{s}$ catches a $0\mathrm{.}47$ kg ball moving at a speed of $27\mathrm{.}5\frac{m}{s}$ with his feet off the ground, while both of them are moving horizontally.

Part $($a$)$

Calculate the final speed of the player, in meters per second, if the ball and player are initially moving in the same direction.

$v_{f,1}=7\mathrm{.}590,$ Correct!

Part $($b$)$

Calculate the change in kinetic energy of the system, in joules, after the player catches the ball.

$K{E}_1=$

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$5$ Submission$($s$)$ Remaining

Hints: $1$ for a $0\%$ deduction. Hints remaining: $0$

Grade Summary

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$-$Use the result of part $($a$).$ Change is final value minus initial value.

Part $($c$)$ darr

Calculate the final speed of the player, in meters per second, if the ball and player are initially moving in opposite directions.

$v_{f,2}=7\mathrm{.}350,$ J Correct!

Part $($d$)\sqrt[\phantom{2}]{?}$

Calculate the change in kinetic energy of the system, in joules, in this case.

$K{E}_3=-284\mathrm{.}29$ Part B please