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  1. A 100 N force acts horizontally on a block of 10 kg placed on a horizontal rough surface of coefficient of friction µ = 0.5. If the acceleration due to gravity (g) is taken as 10 ms–2, the acceleration of the block (in ms–2) is
    1. 2.5
    2. 10
    3. 5
    4. 7.5
Correct Option: C

a =
F - μR
=
100 - 0.5 × (10 × 10)
= 5 ms-2
m10



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