A motor car moving with a uniform speed of 20 P \( \mathrm{m} / \ma...

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A motor car moving with a uniform speed of 20
P \( \mathrm{m} / \mathrm{sec} \) comes to stop on the application of brakes after travelling a distance of \( 10 \mathrm{~m} \). Its acceleration is
W
(1) \( 20 \mathrm{~m} / \mathrm{sec}^{2} \)
(2) \( -20 \mathrm{~m} / \mathrm{sec}^{2} \)
(3) \( -40 \mathrm{~m} / \mathrm{sec}^{2} \)
(4) \( +2 \mathrm{~m} / \mathrm{sec}^{2} \)
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