The work done by gravity formula is given by, W = mgh cos θ W = 5 × 98 × 10√2 cos 450 = 490 J Therefore, the work done by gravity is 490 J Question If work done by gravity on a freely falling object of mass 4Kg is 1000J, Find the height from which it's fallingFormula (i) W = PE = mgh Solution W = mgh = x (98) x 10 = 1960J The work done to take an object of mass kg to a height of 10 m is 1960 J Question 7 A body of 05 kg thrown upwards reaches a maximum height of 5 m Calculate the work done by the force of gravity during this vertical displacement Answer Given Mass (m) = 05 kgU spring = 1 2 kx 2 Work done by conservative forces is path indepen dent and depends only on initial and nal pointsH F~ conservative d~r= 0 Workenergy theorem W= K Mechanical energy E= UK Conserved if forces are conservative in nature Power P av W t;
Physicslab Gravitational Potential Energy
