Question

why do the passenger fall backwards if a vehicle suddenly accelerates​

Answer 1

Answer:

Inertia in a moving bus when the brake is applied

Similarly, the passenger tends to fall back when the bus accelerates from rest because when the bus accelerates, the passenger's inertia tends to oppose the bus's forward motion. Hence, the passenger tends to fall back when the bus accelerates forward.

Answer 2

Answer:

The passengers in a bus tend to fall backward when it starts suddenly due to inertia as the passengers tend to remain in the state of rest while the bus starts to move. When the bus stops suddenly, people fall forward because their inertia as they are in state of motion even when the bus has come to rest.

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