JEE Main 2022 · 29 Jun · Shift 2 · Physics Q45

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PhysicsSingle correct+4 / -1Question 45 of 90

A block of mass 40 kg slides over a surface, when a mass of 4 kg is suspended through an inextensible massless string passing over frictionless pulley as shown below.

The coefficient of kinetic friction between the surface and block is 0.02. The acceleration of block is. (Given $g=10$ ms $^{-2}$ .)

A 40 kg block on a rough horizontal surface tied by a string over a pulley at the edge to a hanging 4 kg mass.

1 ms

^{-2}

1/5 ms

^{-2}

4/5 ms

^{-2}

8/11 ms

^{-2}

Answer and worked solution

Official answer: D

Net force. $40-0.02\times400=32$ N on $44$ kg: $a=\frac{8}{11}$ m s $^{-2}$ .

(D)

Topics:Constraint motion and pulleys Friction

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JEE Main 2022 · 29 Jun · Shift 2, Physics question 45