Energy Transformation A pendulum (1.0 m long) is pulled aside to the position where the bob has been raised vertically a distance of 10. cm. If the bob has a mass of 100. g, calculate: a) the potential energy of the bob before release b) the kinetic energy of the bob at its lowest position c) the velocity of the bob at the lowest position 2. When construction firms wreck old buildings, a large pendulum arrangement is frequently used. If the ball of the equipment suspended on a cable has a mass of 1000. kg and is raised 3.0 m vertically when it is pulled to one side, calculate: a) the kinetic energy of the ball as it strikes the building b) the speed of the ball on impact 3. A 2.0 kg object rolls down an incline 20. m high with an initial speed of 5.0 m/s. Calculate the speed of the object at the bottom of the incline assuming no energy loss due to friction. Provide a sketch with your solution 4. Jill can apply a force of 20. N to the peddles of her bicycle. Jill starts riding her bicycle and peddles 200. m and she reaches a speed of 25 km/h. She then stops pedalling and coasts for 200. m. a) How much work did she do in the first 200. m? b) How much work is Jill doing while she coasts the 200. m