A gardener pushes a lawn-mower of mass along a level path by applying a constant…
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
A gardener pushes a lawn-mower of mass 20kg along a level path by applying a constant force of 40N on the handle which makes an angle of 30∘ with the horizontal. The mower is moved through a distance of 15m along the ground. The coefficient of kinetic friction between the mower and the ground is 0.25.
(i) Calculate the work done by the gardener’s applied force during the 15m displacement.
(ii) Calculate the work done by the force of kinetic friction over the same displacement.
(iii) State whether the net work done on the mower is positive, negative, or zero and justify your answer with the values obtained.