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. 0 s just in time to save the child . 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 .

Options

A. `1.2 xx 10^(3)` N
B. `1.2 xx 10^(4)` N
C. `1.2 xx 10^(5)` N
D. `1.2 xx 10^(6)` N

Answer

B