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Q.

A child pulls a toy train having two carriages with a force of 3 N at an angle of 600 with the horizontal in a vertical plane as shown in fig.

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The tension in the string connecting the carriages is

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a

1 N

b

3 N

c

0.5 N

d

2 N

answer is D.

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Detailed Solution

From figure,

 3cos600=(100×10−3+50×10−3)aor32=(150×10−3)a

∴ a=3×10002×150=10m/s2T=ma=50×10−3×a=50×10−3×10=0.5N.

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