Question

plzzz solve it .............​

Answer 1

Explanation:

Let us assume W to be their weight.(m*g)

Let's go option wise

(D) 2 masses at 2 end of the strings. The net force on that pulley will be sum of 2 weight, Thus would have to lift 2W

(C) Here the net tension on the rope to be pulled will again be 2W as in the same rope they are connected.

Both (B) and (A) the force is shared b/w wall and pulley that is contact with the person , so the weight he pulls becomes only W.

Less weight, quicker is the pulling.

Greater the number of pulleys easier is the work.

One more , in fact the most point to be noted is, in A the F u apply is actually against gravity(upwards) but B pulls it perpendicular to the direction of gravity using tha additional pulley that is in direction of required result.

Hope it helps you!!!

Answer 2

Answer:

see

the pulling force on bricks in case

A is 2F

B is F

C is F and

in case

D pulling force on pulley is F/2

more the force lesser will be the time taken

so A is the answer

my answer is fully correct u can see it's from allen dpp question and the reasons I have given are correct