Question

How does the passenger in the bus stand to fall backward when it start suddeniy?

Answer 1

due to inertia of a person is stand rezt they are come in rest they are not moveing dueto intria of rest the go backward

Answer 2

Due to inertia property.

Before starting bus is in rest position, after the application of force, the force chang es his position, but due to inertia, he tries to continue his rest position which is back side.

Hence he falls backward.