A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface.As the speed of the mass increases at a constant acceleration,the power delivered to it by the force:
A)remains the same.
B)increases.
C)decreases.
D)doubles every 4.0 seconds.

Question

Quizplus · Accepted Answer

The power delivered to the mass is given by the formula P=Fv, where F is the applied force and v is the speed of the mass. Since the acceleration is constant, the speed of the mass will increase linearly with time. Therefore, the power delivered to the mass will increase linearly with time as well, meaning that it will increase as the speed increases. Thus, the correct answer is B.

A Force of 5