Question

If the mass of a car is 3 quintals and it is running at a speed of 100km/h and it increases its speed to 120km/h then find the work done by car engine. ​

Answer 1

Answer:

5.09 x 10^5J

Explanation:

We know that change in kinetic energy = work done

mass of car = 3 quintals = 3000kg

1m²/s² = 5²/18² kmph²

kinetic energy = 1/2 mv²

let v1 = 100kmph

    v2 = 120 kmph

change in kinetic energy = 1/2 mv$_{2}$² -1/2mv$_{1}$²

               work done         = 1/2 x m {v1 +v2}{v1 - v2}

                                           = 1/2 x 3000 x 20 x 220

                                           = 3000 x 2200kgkmph²

                                           = 3000 x 2200 x 25 / 324  

                work done        = 5.09 x 10^5J

                       Hope it helps you  

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