Which of the following objects is in dynamic equilibrium?

a. a car driving in a straight line at 20m/s

b. a book sitting on a table without moving

c. a boy jumping off a diving board into a pool

d. a motorcycle going in a circle at a constant speed

before we can answer, we have to see the choices that are printed there with the question.   that's the only way we can point you to the correct one.

this is a good question! i'll do some research and come back when i have the answer!

the rearrangement of particles in a physical change. hope this