A scooterist moving with a speed of 36 km/h sees a child standing in the middle of the road. He applies the brakes and brings the scooter to rest in 5 s just in time to save the child. Calculate the average retarding force on the vehicle, if mass of the vehicle and the driver is 300kg. (A) 600 N (В) 125 N 150 N D) 270 N

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