Work done by gravity on falling ball in first second and third second
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Work done = Force • Displacement
= mg • displacement
using, d = Vo + (1/2)(a)(t)^2
= (mg)(1/2)(a)(t)^2 (initial velocity = 0)
= (1/2)m(gt)^2
Work done in first second will be
= (1/2)m(g)^2 Joules
Now work done in third second
= Work done in 3 seconds - work done in 2 seconds
= (1/2)m(g3)^2 - (1/2)m(g2)^2
=(5/2)m(g)^2 Joules
= mg • displacement
using, d = Vo + (1/2)(a)(t)^2
= (mg)(1/2)(a)(t)^2 (initial velocity = 0)
= (1/2)m(gt)^2
Work done in first second will be
= (1/2)m(g)^2 Joules
Now work done in third second
= Work done in 3 seconds - work done in 2 seconds
= (1/2)m(g3)^2 - (1/2)m(g2)^2
=(5/2)m(g)^2 Joules
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