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QNEET-2013-Ph-1523: NEET 2013 Physics - Class 11 NEET-2013-Ph-1523 Solution: Three blocks with masses m 2m and 3m are connected by strings…
Three blocks with masses m 2m and 3m are connected by strings as shown in the figure. After an upward force F is applied on block m the masses move upwards at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity) 3mg 6mg zero 2mg
Multiple Choice Options
- A 3mg
- B 6mg
- C zero
- D 2mg
Step-by-Step Verified Solution
From figure
F = 6 mg,
As speed is constant, acceleration a = 0
_ 6 mg = 6ma = 0, F = 6 mg
_ T = 5 mg , T' = 3 mg
T'' = 0
F net on block of mass 2 m
= T � T' � 2 mg = 0
ALTERNATE :
_ v = constant
so, a = 0, Hence, F net = ma = 0