Work, Power and Energy

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Question : 9
Total: 30
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) t2
Solution:  
Power =F×v
P=ma×at
P=ma2t
Pt
(As m and a are constant)
Option (b) is correct.
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