Question

what is the work done to increase the velocity of a car from 36 km/hr to 70 km/hr if mass of car is 1500 kg ???​

Answer 1

Answer:

Approx 208KJ .

Explanation:

see attachment

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Answer 2

The work done by the car is $2.08\times 10^5\ J$.

Explanation:

Given that,

Mass of the car, m = 1500 kg

Initial velocity of the car, u = 36 km/h = 10 m/s

Final velocity of the car, v = 70 km/h = 19.45 m/s

We need to find the work done by the car. We know that the work energy theorem gives the relation between work done and the change in kinetic energy. So,

$W=\Delta K\\\\W=\dfrac{1}{2}m(v^2-u^2)\\\\W=\dfrac{1}{2}\times 1500\times ((19.45)^2-(10)^2)\\\\W=2.08\times 10^5\ J$

So, the work done by the car is $2.08\times 10^5\ J$. Hence, this is the required solution.

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Work energy theorem

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