A block of mass \( m \) is moving with a constant acceleration 'a' ...

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A block of mass \( m \) is moving with a constant acceleration 'a' on a rough horizontal plane. If the
\( P \) coefficient of friction between the block and plane is

W \( \mu \). The power delivered by the external agent at a time \( t \) from the beginning is equal to :
(1) \( \mathrm{ma}^{2} \mathrm{t} \)
(2) \( \mu \) mgat
(3) \( \mu \mathrm{m}(\mathrm{a}+\mu \mathrm{g}) \mathrm{gt} \)
(4) \( m(a+\mu g) \) at
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