Question

8. In the figure shown, a person wants to raise a block
lying on the ground to a
height 'h'. In which
case he has to exert more force. Assume pulleys
and strings are light
1) figure (i)
2) figure (ii)
3) same in both
4)cannot be determined
light and all the surface​

Answer 1

Answer:

ANSWER

Since, h =  

2

1

​  

at  

2

⇒ a should be same in both cases, because h and t are same in both cases as given.

In (i) F  

1

​  

−mg=ma.

⇒F  

1

​  

=mg+ma.

In (ii) 2F  

2

​  

−mg=ma

⇒F  

2

​  

=  

2

mg+ma

​  

 

∴F  

1

​  

>F  

2

​  

.

Answer is A

Explanation: