Change in kinetic energy — task. Physics CBSE Live product, Class 9 (2025-26).

Solve the given problem:

What is the work to be done to increase the velocity of a car from \(25\ kmh^{–1}\) to \(60\ kmh^{–1}\) if the mass of the car is \(1500\ kg\)?

The initial kinetic energy of an object of mass (\(m\)), moving with a initialvelocity, (\(u\)) is given by the expression,

E_{ki} = \frac{i}{i} \times i \times i^{i}

The final kinetic energy of an object of mass (\(m\)), moving with a finalvelocity, (\(v\)) is given by the expression,

E_{kf} = \frac{i}{i} \times i \times i^{i}

Work to be done to increase the velocity is,

Substitute the values,

Work to be done to increase the velocity \(=\) \(J\)

[Note: Enter your answer with two decimal digits]

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9. Change in kinetic energy