Question #64d01

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Answer 1 · 2017-10-15T00:54:21

72.74 m/s

Total energy of glass at that height = Potential energy

#= mgh#

#= 270mg#

Total energy of glass when it reaches the ground = Kinetic energy

= #(mv^2)/2#

Initial Total energy = Final Total energy

#270 mg = (mv^2)/2#

#540mg = mv^2#

Divide both sides by “m”

#540g = v^2#

#v = sqrt(540 g)#

#v = sqrt(540 × 9.8)#

#v = 72.74 ms^-1#