A Physics 205A student drags a sled across the horizontal floor at a constant speed by a rope that is inclined at angle of 20° above the horizontal. What is the sign of the work done by the normal force on the sled?
A. Negative.
B. Positive.
C. (Zero.)
D. (Not enough information is given.)
Answer:C
A Physics 205A student drags a sled across the horizontal floor at a constant speed by a rope that is inclined at angle of 20° above the horizontal. What is the sign of the work done by the normal force on the sled?
A. Negative. B. Positive. C. (Zero.) D. (Not enough information is given.)