SUVAT workout method must be used a) In building a rocket launchpad, a pile driver hammer of mass 110kg falls freely through a distance of 5 m to strike a pile of mass 450kg and drives it 75 mm into the ground. The hammer does not rebound when driving the pile. Determine the average resistance of the ground using D'Alembert's principle. The principle of conservation of energy equates work done in a system to changes in potential energy, changes in kinetic energy, and other energy losses. D'Alembert's principle equates work done to the sum of all forces applied in a system. These are two alternatives, and sometimes complimentary, approaches. b) Validate the result from part a) above using the conservation of energy principle