Question

Two bodies P₁ and P₂ of mass 1 and 2 kg, respectively, are joined by a string passing over a fixed pulley. The distance h between the centres of gravity of the bodies is initially one metre (Fig.). How long after the beginning of the motion will the

centres of gravity of the bodies be at the same height? The mass of the pulley, the weight of the string, and the air resistance may be neglected. 

Answer 1

Answer:

Explanation:

The acceleration of the masses may be found from the equations for Newton's second law.  The acceleration turns out to be

where P₁ and P₂ are the masses of the bodies; the required time is obtained from the equations of motion for uniform acceleration with zero initial velocity. We obtain

t = √(h/a).