Three forces,5.0 N,15.0 N,and 20.0 N,are acting on a 9.81-kg object.Which of the following forces could also be acting on the object if it is moving with constant velocity?
A)1.0 N
B)19.0 N
C)39.0 N
D)any of the above

Question

Quizplus · Accepted Answer

If the object is moving with constant velocity, that means the net force on it is zero. Therefore, any force that can be added to the above forces to result in a net force of zero can also be acting on the object. The forces can be added vectorially, and it can be seen that adding any of the above forces to the given set can result in a net force of zero. Therefore, choice D (any of the above) is the correct answer.

Three Forces,5