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A particle starts moving from rest from a fixed point in a fixed direction. The distance \( s \) from the fixed point at a time \( t \) is given by \( s=t^{2}+a t-b+17 \), where \( a, b \) are real numbers. If the particle comes to rest after \( 5 \mathrm{~sec} \) at a distance of \( s=25 \) units from the fixed point, then values of \( a \) and \( b \) are respectively:
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