Question

car of mass 1000 kg changes its speed from 10 metre per second to 15 metre per second in 20 second . calculate work and power​

Answer 1

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Work-

$K.E.= mv^2$

For work done by the engine we need to take the difference i.e

$W= 0.5 \times 100 \times (20^2- 10^2)$

$W= 1.5 \times 10^4 J$

Power-

$P= \dfrac{work}{time}$

$P =\dfrac{1.5 \times 10^4}{20} = 750 watt$