Question

In the figue shown, a person wants to raise a block lying on the ground to a height $h$. In both the cases if time required is same then in which case he has to exert more force. Assume pulleys and strings light.

• A. (i)
• B. (ii)
• C. Same in both
• D. Cannot be determined

Answer 1

The correct option is A (i)

Case (i)

FBD of all masses
As the tension in the string will remain same so to lift the bloc
$T>mg$

Case (ii)
FBD of individual masses

For block to lift 'off' $2T>mg$
$T>\frac{mg}{2}$
Hence in case (i) he has to exert more tension.