Question

2
(0) 60
12. A disc arranged in a vertical plane has two groves of
the same length directed along the vertical chord AB
and CD as shown in the figure. The same particles
slide down along AB and CD. The ratio of the time
TAB to is
1600
(A) 1:2
(C) 2:1
(B) 1:72
(D) 2:1​

Answer 1

Answer:

where is the figure of this question