What is meant by absolute time? why was it not noticed before the development of the special theory of relativity?

In kinematics, motion equations are derived using the time interval, Δt, between events. Before the concept of special theory of relativity came to be, everyone thought that the time interval, Δt, is the same for every observer, whether the observer is at rest or in motion. This is called absolute time.

However, according to Einstein, time is not absolute; that is, the time interval, Δt, depends upon the velocity of the observer

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

can u provide the graph and if its not possible

then i can tell u the segment where the

average time interval starts degrading is the segment where the car is slowing down