The driver of a three wheeler moving wit...

The driver of a three wheeler moving with a speed of `36 km//h` sees a child standing in the middle of the road and brings his vehicle to rest in 4 s just in time to save the child What is the average retarding force on the vehicle ? The mass of three wheeler is 400 kg and mass of the driver is 65 kg .

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Verified by Experts

`a = -2.5 ms^(-2)` , Retarding force ` = 465 xx 2.5 = 1.2 xx 10^3 = N`

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