It is easier to maintain the motion of a body than to start it. Why?

Why is it easier to start a car engine on a warm day than on a chilly day ?

It is easier to pull a lawn mower than to push it.

It is easier to catch, a table tennis ball than a cricket ball even when both are moving with same velocity. Why?

It is easier to revolve a stone by attaching it to a shorter string rather than- to a longer one. Why?

For a body moving along a straight line, the average velocity is equal to its instantaneous velocity. The motion of the body is

At which point of motion the acceleration of a body executing SHM is zero ?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

Why is it easier to balance a bicycle in motion?

Is it necessary to do work to maintain a constant velocity with a body on a rough. surface?

pK_b of aniline is more than that of methylamine. Why?