An energy storage system is being designed using a number of concrete blocks andelectrically driven carriages, each carriage has a mass 10 000 kg, which can be raisedto a certain height using electric motor driven trains using excess power from acombined solar-wind farm. Power is recovered using the same motors and releasing theconcrete blocks and carriages. If the excess energy on one day is 2 GJ, the maximumheight is 200 m and the efficiency is 100%, how many carriages are needed to store thisenergy (assume g = 10 m/s²).4BCOE52050100200

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