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A bike moving at 20 m/s brakes with a uniform retardation of 4 m/s^2. How long does it take to stop?
A2 s
B4 s
C5 s
D8 s
Answer & Solution
Correct answer: C. 5 s
From v = u + at with v = 0, t = 20/4 = 5 s.
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