Question

Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure coefficient of friction between all the surfaces is 0.2(g = 10 m/s²)

(A) tension in the string is 306 N

(B) Tension in the string is 132 N

(C) Acceleration of block B is 2.6 m/s²

(D) Acceleration of block B is 2.6 m/s²

Answer 1

Correct options are (A) and (D)

Acceleration of block will be zero. Since its constrained.

∴ mg + f₁ = T sin θ   … (i)

N₁ = T cos θ   … (ii)

Mg – f₁ – f₂ = Ma   … (iii)

N₁ = N₂ = T cos θ

f₂ = µ(N₂) = µ T cos θ

Answer 2

Correct answer is

(A) tension in the string is 306 N

(D) Acceleration of block B is 2.6 m/s²