Mass of the ball = 5.4 Kg
Height = 1.6 m
(a)Let the potential energy of the ball at h=0 is 0.
The potential energy of the ball at h=1.6 is "-mgh=-(5.4 \u00d71.6\u00d79.8) = - 84.672 J" (Ans)
(b) "Work done = change in potential energy"
"= P.Ef - P.E.i"
"=(-84.672-0) J"
"= - 84.672 J" (Ans)
(c)According to conservation of energy, "W = change" in Kinetic Energy.
"K.E.f - K.E.i = W"
"K.E.i = 0 J"
"K.E.f = 1\/2 mv2"
"1\/2 mv2 = 84.672 J"
"v2 = 2\u00d784.672\/5.4"
"v = \u221a914.4576 m\/s"
"v = 30.24 m\/s" (Ans)
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