12. A golfer swings his club so that its metal club-head (mass 0.60 kg) strikes a stationary ball (mass 0.045 kg). The v

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12 A Golfer Swings His Club So That Its Metal Club Head Mass 0 60 Kg Strikes A Stationary Ball Mass 0 045 Kg The V 1 (67.16 KiB) Viewed 39 times

12. A golfer swings his club so that its metal club-head (mass 0.60 kg) strikes a stationary ball (mass 0.045 kg). The velocity of the club-head drops from 40 m/s to 35 m/s during the collision. Assume that all velocities are horizontal, as shown in the diagram. BEFORE COLLISION AFTER COLLISION 40ms™¹ 35 ms¹ 0-60 kg 0-045 kg 0-60 kg 0-045 kg (a) (i) Apply the Principle of Conservation of Momentum to find a value for the velocity of the ball after the collision. (b) The ball and club-head are in contact for 1.5 x 10-³ s. Calculate the average force exerted by the club-head on the ball. 13. A tennis ball is hit by a racket as shown in the diagram. 38ms-1 32ms-1 The mass of a tennis ball is 0.058 kg. During a serve the racket head and the ball are in contact for 4.2 ms, Just before contact, the racket head is travelling towards the ball at 38 m/s and the ball is stationary. The diagram shows the situation just before contact. 52ms-1 Immediately after contact, the racket head is travelling in the same direction at 32 m/s and the ball is travelling away from the racket at 52 m/s. This is shown in the diagram. (i) Calculate the force provided by the racket on the ball. (ii) Recall Newton's 3rd Law of motion, calculate the mass of the racket.