In this question, a statement of assertion is followed by …

Physics Work, Energy, Power and Collision Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

Assertion: The instantaneous power of an agent is measured as the dot product of instantaneous velocity and the force acting on it at that instant.
Reason: The unit of instantaneous power is watt.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Text Solution

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The correct answer is:

The rate of doing work is called power.

Thus, , if is the small amount of work done in a small time interval , then instantaneous power is defined as

Now

. But, , velocity of the particle.
Therefore,
Also, unit of power is watt.

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