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In the figure shown, a person wants to r...

In the figure 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

Cannote be determined

Text Solution

Verified by Experts

The correct Answer is:
A
Since, `h=(1)/(2)at^(2)rArra` should be same in both cases, because `h` and `t` are same in both cases as given.

In `(i)F_(1)-mg=ma. `
`rArrF_(1)=mg+ma`
In `(ii)2F_(2)-mg=ma`
`rArrF_(2)=(mg+ma)/(2):.F_(1)gtF_(2)`
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