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Q.

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 m/s to 20 m/s while passing through a distance 135m in ‘t’sec . The value of ‘t’ is…………

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a

1.8 s

b

9s

c

12s

d

10s

answer is B.

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Detailed Solution

u=10m/sv=20m/ss=135mFrom equation  v2−u2=2as⇒202−102=2a135 ∴a=400−100270=3027m/s2 Time taken is  t=v−ua=20−103027=27030=9 s
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A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 m/s to 20 m/s while passing through a distance 135m in ‘t’sec . The value of ‘t’ is…………