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प्रश्न
Three blocks with masses m, 3m and 6m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 3 m? (g is the acceleration due to gravity)
विकल्प
zero
2 mg
3 mg
6 mg
MCQ
उत्तर
zero
Explanation:
Since all three blocks are moving up with a constant speed v, acceleration a is zero.
⇒ F = 0
∴ Net force is zero.
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