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Question

An object of mass 5kg is kept on a smooth inclined plane of inclination 30o. What minimum force Fa as shown in figure must be applied that would just make the block to move up the plane ?
(take g=10ms2)

7822_11abb59d4a0d4e09b24948a996773f04.png

A
25 N
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B
50 N
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C
253N
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D
503N
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Solution

The correct option is C 503N
The force acting on the object due to gravity for sliding down is mgsinθ which is equal to 25 N here.
now, the component of the horizontal force Fa along the incline plane should be equal to 25 N. For that,
Facos30°=25
Fa=503 N

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