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How much work do the breaks on a 3200 kg car need to do in order to slow it from 30 m/s to 20 m/s?

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter3: Energy And Conservation Laws

Section: Chapter Questions

Problem 36P: . An elevator is able to raise 1,000 kg to a height of 40 m in 15 s. (a) How much work does the...

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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

How much work do the breaks on a 3200 kg car need to do in order to slow it from 30 m/s to 20 m/s?

A.675 kJ

B.945 kJ

C.580 kJ

D.342 kJ

E.800 kJ

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