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Q.

A point size mass 100 gm is rotated in a vertical circle using a cord of length 20cm. When the string makes an angle 60° with the vertical , the speed of the mass is 1.5m/s. The tangential acceleration of the mass in that position is ( in ms–2) 

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a

4.9

b

9.8

c

4.92

d

4.93

answer is C.

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Detailed Solution

at = gsinθ

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