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A mass of 0.1 kg is rotated in a vertical circle using a string of length 20 cm. When the string makes an angle 30o with the vertical, the speed of the mass is 1.5ms–1. The tangential acceleration of the mass at that instant is

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a

4.9 ms–2

b

9.8 ms–2

c

2.45 ms–2

d

19.6 ms–2

answer is A.

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Detailed Solution

at = mgsinθ / m= g sin θ= 9.8 x sin 300 m/s2= 4.9 m/s2

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