Apendulum with an arm length of 28 cm is pulled back to a maximum angle of 40 degrees. attached to this pendulum arm is a bob of mass 2 kg. assuming negligible friction in the system, fine (a) the gravitational potential energy of the bob initially, the kinetic energy of the bob initially, the total energy of the bob initially, and the work done by non-conservative forces (if any). (b) find the gravitational potential energy and the kinetic energy of the bob as it swings through its lowest point. (c) calculate the speed of the bob when it is moving the fastest. (d) to what height (measured upwards from its lowest point) does the bob reach before coming to rest?