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23. Two masses m1 and m2 (m1 > m2) are connected by massless flexible and inextensible string passed over massless and frictionless pulley. The acceleration of centre of mass is

(a) (m₁– m₂/ m₁+ m₂) ² g

(b) m₁– m₂ / m₁+ m₂g

(c) m₁+ m_{2 /} m₁– m₂ g

(d) Zero

Ans . a

PrevPrevious19. A light string passing over a smooth light pulley connects two blocks of masses m 1 and m 2 (vertically). If the acceleration of the system is g/8 then the ratio of the masses is

NextA particle of mass m moving with a velocity u makes an elastic one dimensional collision with a stationary particle of mass m establishing a contact with it for extremely small time T. Their force of contact increases from zero to F0 linearly in time T/4, remains constant for a further T/2 time and decreases linearly from F0 to zero in further time T/4 as shown. The magnitude possessed by F0 isNext

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