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Question

A block rests on a rough inclined plane making an angle of 30 with horizontal. The coefficient of static friction between the block and inclined plane is 0.8. If the frictional force on the block is 10N, the mass of the block in kg is (g=10m/s2)


Your Answer
A
0.5 kg
Correct Answer
B
2 kg
Your Answer
C
5 kg
Your Answer
D
20 kg

Solution

The correct option is C 2 kg
For any object which rests on rough inclined plane,
mgsinθ = frictional force(f)
m(10) sin 30 = 10
m = 2 kg

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