sinsin846 sinsin846
  • 12-11-2017
  • Physics
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If a 25.5 kg child climbs 2 steps of 20 cm each, the work performed is

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Аноним Аноним
  • 22-11-2017
m = 25.5 kg, the mass of the child
h = 2*20 = 40 cm = 0.4 m
g = 9.8 m/s², acceleration due to gravity.

The work done is equal to the increase in PE (potential energy).
Therefore the work done is
W = (mg)*h
    = (25.5*9.8 N)*(0.4 m)
    = 99.96 J

Answer: 99.96 J

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