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Q.

A car accelerates from rest at a constant rate of 2 m/ s2 for some time. Then, it retards at a constant rate of 4 m / s2 and comes to rest. What is the maximum speed attained by the car, if it remains in motion for 3 seconds ?

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a

2 m/s

b

3 m/s

c

4 m/s

d

6 m/s

answer is C.

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Detailed Solution

umax=αβtα+β=2×46×3=4m/s
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