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what is the magnitude to bring the car to rest in a distance of 50 m

Physics
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a 1580 kg car is travelling at a speed on 15.0 m/s. what is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0m?

Oct 8th, 2014

The kinetic energy of the car is 

1/2 m v² = 1/2 ( 1580 kg ) ( 15.0 m/s )² = 177,750 J 

Work is the scalar product of force and distance so 

177,750 J = F d = F ( 50.0 m ) 

F = 3,555 N

Oct 8th, 2014

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