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Question:

A block of mass 5kg is (i) pushed in case (A) and (ii) pulled in case (B), by force F=20N, making an angle of 30° with the horizontal, as shown in the figures. The coefficient of friction between the block and floor is μ=0.2. The difference between the accelerations of the block, in case (B) and case (A) will be: (g=10ms⁻²)

3.2ms⁻²;

0.8ms⁻²;

0ms⁻²;

0.4ms⁻²;

Solution:

Correct option is B. 0.8ms⁻²
N₁=60
N₂=40
a₁=10/3 - 0.2 × 60/5 = 1.064
a₂=10/3 - 0.2 × 40/5 = 1.86
a₂ - a₁ = 0.8