a mam of mass 70kg a seconds a flight of 36 steps each 20cm high work done by the mam against gravitational force is (g=9.8ms-2 a)49.392 J b)4000J c)490J d)4900J
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a mam of mass 70kg a seconds a flight of 36 steps each 20cm high work done by the mam against gravitational force is (g=9.8ms-2 a)49.392 J b)4000J c)490J d)4900J
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