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

Find the correct answer:

Certain force acting on a 30 \(kg\) mass changes its velocity from 8

m s^{- 1}

to 1

m s^{- 1}

. Calculate the work done by the force.

The kinetic energy possessed by an object of mass (\(m\)) and moving with a velocity (\(u\)) is,

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

Initial kinetic energy of the object \(=\) \(J\)

The kinetic energy possessed by an object of mass (\(m\)) and moving with a velocity (\(v\)) is,

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

Final kinetic energy of the object \(=\) \(J\)

Work done \(=\) \(J\)

[Note: Enter the answer upto 2 decimal places.]

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8. Change in energy