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Q. A kg steel ball strikes a wall with a speed of m/s at an angle of with the surface. It bounces off with the similar speed and angle. If the ball is in contact with the wall for s, what is the average force exerted on the ball by the wall?

Q. A raft is made of 13 logs lashed together. Each is 37 cm in diameter and has a length of 5.6 m. How many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 70 kg? Do not avoid the weight of the logs. Assume the density of wood is 600 kg/m.

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