A freight trolley of mass 200kg rolls along a horizontal track at a speed of 2m/s.
a. (i) Calculate its kinetic energy.
b. (ii) While the trolley is at rest, goods of mass 50kg are loaded onto it. The loaded trolley is then set in motion again at the same speed of 2m/s. Calculate the new kinetic energy.
c. (iii) By what percentage has the kinetic energy increased due to loading the goods? Show the steps clearly.
d. (iv) The 250kg loaded trolley is now accelerated until its kinetic energy becomes four times the value obtained in part (ii). Determine its new speed.