A man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a light rope and two fixed pulleys as shown in figure. Indicate the correct statements : (assume both the friends apply equal forces of equal magnitude)
A. The force exerted by both the friends decreases as the man move up
B. The force applied by each friend is `(mg)/(4h) sqrt(d^(2)+4h^(2))` when the man is at depth of `h`
C. The force exerted by both the friends increases as the man moves up
D. The force applied by each friend is `(mg)/(h) sqrt(d^(2)+h^(2))`
