Answer
P = 378 W
Work Step by Step
At t = 5.00 s:
$v = at = (2.80~m/s^2)(5.00~s) = 14.0~m/s$
$F = (5.40~N/s)(5.00~s) = 27.0 ~N$
We can use the force and the speed to find the power.
$P = F~v = (27.0~N)(14.0~m/s)$
$P = 378~W$
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