how do i solve this, i tried dividing the mass by the height, but its wrong

A 407-kg pile driver is raised 15 m above ground.

(a) How much work must be done to raise the pile driver?__kj

(b) How much work does gravity do on the driver as it is raised?__kj

(c) The driver is now dropped. How much work does gravity do on the driver as it falls?__ kJ

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