Question

When a stationery bus suddenly speeds up all passengers are thrown behind. Explain why?

Answer 1

if a stationary bus suddenly speeds up passengers are thrown backward direction and it happens due to the Newton's Motion Law. When a stationary bus moves suddenly the inertia acts upon a person and he will be thrown out of the bus directly.

Answer 2

this happens because of inertia of motion. when the bus starts moving the body of the passenger gets pushed back to its original position this phenomenon can be explained by Newton's second law of motion.