A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?
A)5 N
B)12 N
C)20 N
D)25 N
E)35 N

Question

A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves? 
A)5 N 
B)12 N 
C)20 N 
D)25 N 
E)35 N

Quizplus · Accepted Answer

The Answer is B

A Box with a Weight of 50 N Rests on a Horizontal