Multiple Choice
A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 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) 4 N
B) 10 N
C) 14 N
D) 25 N
E) 35 N
Correct Answer:

Verified
Correct Answer:
Verified
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