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Question

A bus accelerates from the rest for time t1 at a constant rate α then retards at a constant rate β for time t2 and comes to rest, Then t1/t2

A
αβ+α
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B
β+α2
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C
β+αα
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D
βα
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Solution

The correct option is D βα
Let maximum velocity achieved =vmax
vmax=0+αt1=αt1
Also 0=vmaxβt2vmax=βt2
αt1=βt2t1t2=βα

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