detailed solution

4. A player hits a football that is initially at rest and move 22m/s. Find the: a. Momentum of the football if it has mass of 0.48kg. b. Force exerted on it when the time of contact is 0.03s c. Impulse in the football 5. A ball weighing 27Kg hits a hard surface in normal direction with a speed of 13 m/s and rebounds with the same speed. The ball remains in contact with the hard surface for 0.13 minutes. Find the magnitude force on the ball applied by the surface. 6. During the 2007 French Open, Venus Williams hit the fastest recorded serve in a premier women's match, reaching a speed of 210km/h. What is the force exerted on the 0.068Kg tennis ball by William's racket, assuming that the ball's speed just after impact is 210km/h, that the initial horizontal component of the velocity before is insignificant, and that the ball remained in contact with the racket for 57 seconds