Re: Kindly let me Yes. Both are correct.
(There are other uses as well, such as soldiers falling in on the parade ground, but in terms of 'falling down':
"He overbalanced on the roof and fell to the ground, breaking his leg."
'to' emphasizes the direction of the movement "The girl jostled(=push, elbow, or bump against (someone) roughly) him, and his ice-cream was knocked out of his hand and fell on the ground."
'on' emphasizes where it lands, ends. |