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Q.

A train accelerates from rest for time t1 at a constant rate α and then it retards at the constant rate β for time t2 and come to rest. The ratio of t1/t2 is equal to

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a

α/β

b

β/α

c

α2/β2

d

β2/α2

answer is B.

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Detailed Solution

v=0+αt1 or t1=v/α0=v−βt2 or t2=v/β∴t1t2=βα

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