5. A high jumper clears the pole at a height of 2.36 m, then falls safely back to the ground. The change in the jumper's gravitational potential energy from the pole to the ground is -1.65 x 10#J. Determine the jumper's mass. ANS: 71.3 kg Concept Variables Involved Equation work done by a constant force W - work W - (F cos DAd F - magnitude of the force # - angle between the force and the displacement Ad - magnitude of the displacement kinetic energy Ex - kinetic energy work-energy theorem W- total work WE- AE (assuming no change in any AE - change in kinetic energy other form of energy) gravitational potential energy AE - change in gravitational potential energy AE - mgay at Earth's surface m mass - magnitude of the gravitational field constant Ap - vertical component of the displacement