A laboratory trolley of mass 15kg is initially at rest on a smooth horizontal floor. A student pulls it by applying a constant horizontal force of 45N for 4s. After the first trial the student places an additional 5kg load on the trolley and repeats the experiment.
Answer the following:
a. (a) Calculate the acceleration produced in the trolley when the applied force is 45N and the mass is 15kg.
b. (b) If the same 45N force is now applied to the loaded trolley of mass 20kg, determine the acceleration obtained.
c. (c) To make the loaded trolley accelerate at the same rate as in part (a), find the magnitude of the horizontal force that must be applied.