State the reason for the following:
$(a)$ All cars are provided with seat belts.
$(b)$ It is dangerous to jump out of a moving bus.
$(c)$ Road accidents at high speeds are much worse than accidents at low speeds.

(N/A) Cars are provided with seat belts to prevent injuries in case of an accident. The seat belt increases the time taken by the passenger to fall forward,thereby reducing the force exerted on them.
$(b)$ When a person jumps out of a moving bus,their body is in a state of motion due to inertia. Upon hitting the ground,the lower part of the body comes to rest suddenly due to friction,while the upper part continues to move forward,which can cause the person to fall and get injured.
$(c)$ This is because the momentum $(p = mv)$ of a vehicle is directly proportional to its velocity. At high speeds,the momentum is significantly higher,leading to a greater impulsive force during a collision,which causes more severe damage and injuries.