Question

A horizontal force is exerted on a 20 kg box to slide it up on an inclined plane with an angle of 30°. The frictional force retarding the motion is 80 N. If the box moves with a constant speed, then the magnitude of the force is:(Take g=10 ms-2)

• A. 50$\sqrt{2}$ N
• B. 100 N
• C. 80$\sqrt{3}$ N
• D. 100$\sqrt{2}$ N
• E. 120$\sqrt{3}$ N

Answer 1

Answer: (E)

120$\sqrt{3}$ N

Answer 2

The correct answer is (E): 120$\sqrt{3}$ N