Question

A body moves in a straight line with a constant speed. Which of the following must be true?
A) There is a single constant force acting in direction of motion
B) There are no frictional forces acting
C) There is a constant net force acting in direction of motion
D) There is no net force acting on the body

Answer 1

explain why also please

Answer 2

according to newton's second law, if a body moves in a straight line with a constant speed, the resultant force on the body should be zero.

According to it,
A) is incorrect.
B) is also incorrect since there can be a frictional force and some other force acting against it which makes the resultant force equal to zero.
C) is also incorrect according to the above theory
D) is the answer

Answer 3

Thank you!

Answer 4

you're welcome