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Applying NLM along 3 Axis

Three masses ...

Question

Three masses of 16kg, 8kg and 4kg are placed in contact as shown in figure. If a force of 140 N is applied on 4kg mass, then the force on 16kg will be:

A

140N

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B

120N

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C

100N

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D

80N

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Solution

The correct option is C 80N
Treating the body as a single object and using the formula
$F = m \times a$
where m = combined mass of the system $= 28 k g$ .
Hence, the acceleration $= 5 m s^{- 2}$ Again for the 16 kg block the horizontal force experienced will be 80N.

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