Someone kicks a 0.44-kg soccer ball traveling at 8.0 m/s.After the kick, the bal

Question

Someone kicks a 0.44-kg soccer ball traveling at 8.0 m/s.After the kick, the ball travels at the same speed but in the opposite direction. A. Choose a Positive direction for momentum. What is thechange in momentum for the soccer ball? B. If the ball is in contact with the kicker's foot for 0.75s, what is the average force exerted on the ball? Someone kicks a 0.44-kg soccer ball traveling at 8.0 m/s.After the kick, the ball travels at the same speed but in the opposite direction. A. Choose a Positive direction for momentum. What is thechange in momentum for the soccer ball? B. If the ball is in contact with the kicker's foot for 0.75s, what is the average force exerted on the ball?

Explanation / Answer

=(mass)(velocity) ; so, changein =(.44kg)(-8.0m/s)-(.44kg)(8.0m/s) ; changein =-7.04 kg m/s
B.) change in =(average force)(Time), so move timeto the other side and we have:     avg force=(change in )/t ; avgforce=(-7.04 kg m/s)(0.75s) ; avg force= -5.28 N *Note: the negative force just means that the kicker provideda force opposing the original motion.
Hope this helps!

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