Question

Hari goes to school....
(on/upon) foot.​

Answer 1

Step-by-step explanation:

On foot' is the more commonly used expression.This also stems from the fact that 'on' is usually used for actions involving body parts.

'By' is usually used to talk about a means of transport (i.e. train, car, boat, plane, etc).

They both have the same meaning, albeit with different grammatica

Answer 2

Answer:

Hari goes to school on foot