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# Help pls Question 3 (a) A 60 kg block is at rest on a smooth horizontal...

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###### Help pls Question 3 (a) A 60 kg block is at rest on a smooth horizontal...
help pls
Question 3 (a) A 60 kg block is at rest on a smooth horizontal surface as shown in Fig. 23a. A force of 90 N acting at an angle of 35° is applied to the block for 7s. Determine the final velocity and the normal force which the smooth surface exerts on the block during the time interval F-90N u=0 Fig. 23a (5 marks) (b) A ball of mass 625 g hits the ground with the following velocity (Fig. 23b). The coefficient of restitution is 0.88. 15 m/s Lecture & Notes - 2016 Coments and principle of Fig. 23a (5 marks) (b) A ball of mass 625 g hits the ground with the following velocity (Fig. Q3b). The coefficient of restitution is 0.88. 15 m/s 20 Fig. 236 Given that the time of collision is 0.3 s, find the average contact reaction force acting on the ball during the impact (10 marks)

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