Posted by Jessica on .
A 0.45 kg soccer ball approaches a player horizontally with a velocity of magnitude equal to 35 m/s. The player heads the ball straight back out horizontally, and the magnitude of the ballâ€™s velocity after the collision is 40 m/s. The contact time between their head and the ball is 5 ms. What average force does his head experience?

physics 
Elena,
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