Points P, Q and R are in a vertical line such that PQ = QR. A ball at P is allowed to fall freely. The ratio of times of descent through PQ and QR is

Points P, Q and R are in a vertical line such that PQ = QR. A ball at

1.	Points P, Q and R are in a vertical line such that PQ = QR. A ball at P is allowed to fall freely. The ratio of times of descent through PQ and QR is
Answer» 1:1 1:`sqrt(2)` 1:`(sqrt(2)-1)` 1:`(sqrt(2)+1)` Answer :80 m, 4 s