Question

the driver of a three wheeler moving with aspeed of 36 km/h sees a child standing in the middle of the road and bring his vehicle to rest in 4.0s just in time to save the child . what is the average retarding force on the vehicle ? the mass of the three wheeler is 400kg and the mass of the driver is 60 kg

Answer 1

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u = 36 km/h

v = 10 m/s

t = 4 s

Mass of three- wheeler, m = 400 kg

Mass of the driver, m' = 65 kg

Total mass of the system, M = 400 + 65 = 465 kg

▪Using the first law of motion, the acceleration (a) of the three-wheeler can be calculated as:

v = u + at

=> a= v- u / t = (0-10)/4 = -2.5 m/s^2

◾The negative sign indicates that the velocity of the three-wheeler is decreasing with time.

◾Using Newton’s second law of motion, the net force acting on the three-wheeler can be calculated as:

F = Ma = 465 × (–2.5) = –1162.5 N

◾The negative sign indicates that the force is acting against the direction of motion of the three-wheeler.

I hope, this will help you___❤❤

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