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The length of a ballistic pendulum is 1 m and mass of its block is 1.9 kg. A bullet of mass 0.1 kg strikes the block in horizontal direction with a velocity 100 ms–1 and got embedded in the block. After collision the combined mass swings away from lowest point. The tension in the string when it makes an angle 60° with vertical is ( g = 10 ms–2 )

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a

20 N

b

30 N

c

40 N

d

50 N

answer is C.

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Detailed Solution

mu=(m+M)v; If Vθ is Velocity at an angle θv2-v 2=2g11-cos ; find vθthen Tθ=mv02r+mg cosθ

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The length of a ballistic pendulum is 1 m and mass of its block is 1.9 kg. A bullet of mass 0.1 kg strikes the block in horizontal direction with a velocity 100 ms–1 and got embedded in the block. After collision the combined mass swings away from lowest point. The tension in the string when it makes an angle 60° with vertical is ( g = 10 ms–2 )