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Questions  

When a train starting from rest is uniformly accelerating, a plumb bob hanging from the roof of a compartment is found to be inclined at an angle of 45o with the vertical . The time taken by the train to travel a distance of ½ km will be nearly

a
7s
b
10s
c
15s
d
25s

detailed solution

Correct option is B

acos⁡θ=gsin⁡θ;s=ut+12at2

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