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The driver of a three - wheeler moving with a speed fo 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in `4.0` s just in time to save the chile . What is the average retarding force on the vehicle ? The mass of the three - wheeler is 400 kg and the mass of the driver is 65 kg .

Text Solution

Verified by Experts

Here , u = 36 km/h = 10 m/s v = 0 , t = s
m = `400 + 65 = 465` kg
Retarding force
`F = ma = (m(v-u))/t = (465(0-10))/4`
` = -1162 N `
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