A block is pulled from rest up a straight –long incline that makes an angle of with…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A 3.0kg block is pulled from rest up a straight 5.0m–long incline that makes an angle of 30∘ with the horizontal. The magnitude of the pulling force exerted by a cable is 80N at the bottom of the incline and increases uniformly to 100N at the top. The coefficient of kinetic friction between the block and the surface is 0.10.
What is the speed of the block when it reaches the top of the incline?
(a) 18m/s
(b) 16m/s
(c) 14m/s
(d) 20m/s