Question
Physics Question on work, energy and power
Under the action of a constant force, a particle is experiencing a constant acceleration. The power is
A
Zero
B
Positive constant
C
Negative constant
D
Increasing uniformly with time
Answer
Increasing uniformly with time
Explanation
Solution
Instantaneous power is P=F.V=F.at
As force & acceleration are constant.
So, velocity of the particle must be keep on increasing.
Hence, power is increasing uniformly with time.
i.e. P∝t