A body is initially at rest. It undergoes ...

Work, Power and Energy

Question : 9 of 30

Marks: +1, -0

A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to

(a)

t^{1/2}

(b)

t

(c)

t^{3/2}

(d)

t^{2}

Solution:

Power

= F \times v

P = m a \times a t

P = m a^2 t

\therefore P \propto t

(As m and a are constant)

Option (b) is correct.

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