Intext Questions V — task. Science CBSE, Class 9.

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1. Write an expression for the kinetic energy of an object.

If a body of mass \(m\) is moving with a speed \(v\), then its Kinetic Energy. \({E_k}\) is given by the expression,

\(E_k\ =\ \frac{m}{v^2}\)
\(E_k\ =\ \frac{1}{2}\ m \times v\)
\(E_k\ =\ m \times v^2\)
\(E_k\ =\ \frac{1}{2}\ m \times v^2\)

SI unit of Kinetic Energy is .

2. What is power?

Power is defined as the rate of doing work or the rate of transfer of energy. If an agent does a work \(W\) in time \(t\), then power is given by:

\(Power\ (P)\ =\ {Work\ (W)} \times {Time\ (T)}\)
\(Power\ (P)\ =\ \frac{Work\ (W)}{Time\ (T)}\)

The unit of power is .

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32. Intext Questions V

Exercise condition: