If F=120N which is parallel to the inclined plane, find the tension T2 in string. (g=10m/s2)
A
15N
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B
30N
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C
45N
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D
60N
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Solution
The correct option is D60N Considering (2kg+4kg+6kg) as a system, the FBD of the 12kg body is
As 120N>12gsin37∘(=72N), the system will accelerate up the plane.
Hence a=120−7212=4m/s2
Hence for calculating T2, consider the FBD of (2kg+4kg) T2−6gsin37∘=ma=6×4 ⇒T2=60N