Question

An 135 KW engine can accelerate a car from rest to a top speed in 9 s. How much work did the engine do?

Answer 1

Answer:

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Answer 2

Given:

An 135 KW engine can accelerate a car from rest to a top speed in 9 s.

To find:

Work done by the engine ?

Calculation:

Power of any machine is defined as the rate of doing work.

$\sf \therefore \: power = \dfrac{work}{time}$

$\sf \implies \: work = power \times time$

$\sf \implies \: work =(135 \: kW) \times (9 \: s)$

$\sf \implies \: work =(135000 \: W) \times (9 \: s)$

$\sf \implies \: work =1215000 \: joule$

$\sf \implies \: work =1215 \: kilojoule$

So, net work done is 1215 kJ.