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Subject :NSO    Class : Class 9

A scooterist moving with a speed of 36 km h-1 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 child. If mass of the scooter and driver is 300 kg, the average retarding force on the scooter is

A6 × 107 g cm s-2
B6 × 104 g m s-2
C6 × 105 kg cm s-2
D6 × 103 kg m s-2

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