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A solid ball is suspended from the ceiling of a motor car through a light string. A transverse pulse travels at the speed $60 c m s^{- 1}$ on the string when the car is at rest. When the car accelerates on a horizontal road, speed of the pulse is $66 c m s^{- 1}$ . The acceleration of the car is nearly $(g = 10 m s^{- 2})$

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$5.5 m s^{- 2}$

$6.8 m s^{- 2}$

$2.9 m s^{- 2}$

$4.3 m s^{- 2}$

answer is C.

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Detailed Solution

$V = \sqrt{\frac{T}{μ}}$

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