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Q.

A string of mass 2.5 kg is under a tension of 200 N. The length of stretched string is 20 m. If a transverse jerk is struck at one end of the string, the time taken by the jerk to reach the other end is

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a

2.5 s

b

0.5 s

c

1.5 s

d

2 s

answer is A.

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Detailed Solution

detailed_solution_thumbnail

V=Tμ and t=LV

=200/0.125=1600=40m/s ∴ Time taken by the disturbance to reach the other end, t=l/v=20/40=0.5 s

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