Too many forces to deal with!
The driver of a car moving at a speed of 10 m/s sees a child and immediately applies brakes to bring the car to rest in 150 meters , just in time to save the child . If the mass of the car is 1140 kg and that of the driver is 60 kg , Find the magnitude of retarding force on the vehicle.(in newtons)
The answer is 400.
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1 solution
Initial velocity = sqrt[2 a x]. [(Initial velocity)^2]/(2 x)=a=1/3 m/s^2. Then use F=ma-->1200kg (1/3 m/s^2)=400 Newtons.