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A ball is suspended by a thread from the ceiling of a tram car. The brakes are applied and the speed of the car changes uniformly from 36 kmh–1 to zero in 5 s. The angle by which the ball deviates from the vertical is (g = 10 ms–2)

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a

tan−1⁡13

b

sin−1⁡15

c

tan−1⁡15

d

cot−1⁡13

answer is C.

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v=u+at,tan⁡θ=ag

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A ball is suspended by a thread from the ceiling of a tram car. The brakes are applied and the speed of the car changes uniformly from 36 kmh–1 to zero in 5 s. The angle by which the ball deviates from the vertical is (g = 10 ms–2)