Question

if a stationary bus suddenly speeds up,passengers are thrown in the backward Direction?

Answer 1

The body moves backward because the lower part part of our body which is connected with the floor of the bus is in inertia of motion but the upper part of our body is still in inertia of rest and hence we fall backward.

Answer 2

because the lower part of body being in contact of the floor of bus come in motion and the upper part of body remains at rest due to inertia of rest .Hence the passenger fall backward