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Question

A vehicle travelling at 30 m/s stops at a distance of 50 m decelerating uniformly. A force of 9000 N is exerted on it by the brakes. What is the work done by the brakes?

A
4.5×104 J
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B
2.7×105 J
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C
4.5×105 J
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D
2.7×104 J
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Solution

The correct option is D 4.5×105 J
The work done by the brakes is calculated using the relation ,
W=F×s,
where F is the force applied and s is the displacement in the direction of force.

Hence, W=9000×50=4.5×105 N

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