An initial force F1 is applied to a ball. The ball then rolls away along the floor west to east. A frictional force, f, opposes the motion of the ball. What is the magnitude and direction of the additional force that should be applied to the ball to keep it moving at the same velocity? the magnitude is F=sqrt(F1^2+h^2)
Now choose from one of the following options Why?
a. f in the direction from west to east
b. f in the direction from east to west
c. F1 - f in the direction from west to east
d. F1 - f in the direction from east to west