A 5kg block and a lighter block of mass m are connected by a string passing over a pulley when the system is cut if lighter mass ascends (5/g) m before it begins to decend find m.
1. 3kg
2. 4kg
3. 3.5kg
4. 2kg
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Explanation:
T--3g = 3a. (mass3kg will go up with accln. a) ( ,2)
T will be the same on both sides,pulley being frictionless, and string being inelastic.
Adding ( 2) and (1)
2g= 8a
a= 20 / 8 m/ s^2
From 1
50 —T = 5*20/8
T= (400 — 100)/8
T = 300 /8.Newton
Total pull or load on the pulley
2T= 600/8 Newton.= 75Newton
= 75 Newton.
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