19. When a running car stops suddenly, the passengers tends to lean forward because of :

(A) Centrifugal Force

(B) Inertia of Rest

(C) Inertia of Motion

(D) Gravitational Force

Ans. (C) Inertia of Motion

When a running car stops suddenly  the passenger tends to lean forward because of Inertia of Motion. When the bus is running, the whole body of the passenger is in the state of motion. When the bus stops suddenly, the lower part of the passengers body which is in contact with the bus, comes to rest. But the passengers upper portion remains in the state of motion due to the inertia of motion. This is the reason for the passenger to lean forward when the bus stops suddenly.