The velocity of a particle at an instant is \( 15 \mathrm{~ms}^{-1} \). After \( 5 \mathrm{~s} \...

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The velocity of a particle at an instant is \( 15 \mathrm{~ms}^{-1} \). After \( 5 \mathrm{~s} \), its velocity will become \( 25 \mathrm{~ms}^{-1} \). The velocity at \( 4 \mathrm{~s} \), before the given instant will be
(a) \( 23 \mathrm{~ms}^{-1} \)
(b) \( 7 \mathrm{~ms}^{-1} \)
(c) \( 25 \mathrm{~ms}^{-1} \)
(d) \( 15 \mathrm{~ms}^{-1} \)
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