Question

An object cannot remain at rest unless which of the following holds?

a. The net force acting on it is zero.
b. The net force acting on it is constant and nonzero.
c. There are no forces at all acting on it.
d. There is only one force acting on it.

Answer 1

An object can remain at rest if the net force acting on it is zero (a) OR there are no forces at all acting on it (c).

Answer 2

a. The net force acting on it is zero.