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A heavy ball of mass M is suspended from...

A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m(mltltM). When the car is at rest, the speed of transverse waves in the string is `60,ms^(-1)`. The value of a, in terms of gravitational acceleration g, is closest to :

A

`(g)/(30)`

B

`(g)/(5)`

C

`(g)/(10)`

D

`(g)/(20)`

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