50 points question (Who is known as father of science)Albert Einstein​

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.