A car is moving with a velocity of \( 30 \mathrm{~ms}^{-1} \). On applying the brakes, the veloc...

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A car is moving with a velocity of \( 30 \mathrm{~ms}^{-1} \). On applying the brakes, the velocity decreases to \( 15 \mathrm{~ms}^{-1} \) in \( 2 \mathrm{~s} \). The acceleration of the car is
(a) \( +7.5 \mathrm{~ms}^{-2} \)
(b) \( -7.7 \mathrm{~ms}^{-2} \)
(c) \( -7.5 \mathrm{~ms}^{-2} \)
(d) \( +15 \mathrm{~ms}^{-2} \)
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