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Questions  

An eraser weighing 2N is pressed against the black board with a force of 5N. If the coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards

a
2N
b
2.8N
c
4N
d
4.8N

detailed solution

Correct option is C

Freq = w + f = 2 + µN= 2 + 0.4 × 5 = 2 + 2 = 4N

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