When a uniform solid sphere and a disc of the same mass and of the same radius rolls down a rough inclined plane from rest to the same distance, then the ratio of the time taken by them is
When a uniform solid sphere and a disc of the same mass and of the same radius rolls down a rough inclined plane from rest to the same distance, then the ratio of the time taken by them is
- A
$15 : 14$
- B
$15^2 : 14^2$
- C
$\sqrt {14} :\sqrt {15} $
- D
$14 : 15$
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