# A uniform rectangular marble slab is 3.4m long and 2.0m wide . it has a mass of 180kg . if it is originally lying on a flat ground , the work required to stand on it on an end is?

The work is done against gravity $W= mgh$

where h  is the height through which the center of mass is raised

now

$W= 180 kg \times 9.8 m/s^{2} \times 1.7 m \\ W = 3.0kj$

Hence, work needed to stand it on end $W = 3.0 kj$

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