Question

A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.45 kg and time of contact with the football is 0.035 s, what is the force exerted on the foot?

Answer 1

according to the Newton's second law

force = rate of change of momentum

F = mv / t

= 0.45*30 / 0.035

= 385.7 N

so the force exerted on the foot is 385.7 N