A car has a mass of 1000 kg and kinetic energy of 129600 J. The driver of the car applies the brake when he suddenly sees an obstacle. The car comes to a halt after travelling 100 m distance without meeting with an accident. Calculate the frictional force.

1250 N

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626 N

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1290 N

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1296 N

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Solution

The correct option is D
1296 N

Work done = $K_{f i n a l}$ - $K_{i n i t i a l}$ , final kinetic energy = 0

F $\times$ S = 0 – 129600

F $\times$ 100 = -129600

F = -1296 N

Negative sign implies that the frictional force is acting opposite to the direction of motion.

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