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A boy of mass 8kg falls from rest from a height of 100m, neglecting air resistance calculate his total energy after fallin down...Asked by Gbadebo oluwatosin
A ball of mass 8kg falls from rest from a height of100m neglecting air resistance calculate.its total enegy after falling a distance of 400.
Answers
Answered by
Henry
F = m*g = 8kg * 9.8N/kg = 78.4 N.
Epmax = F*h = 78.4 * 100 = 7840 Joules.
Ek + Ep = 7840
Ek + 78.4*(100-40) = 7840
Ek + 4704 = 7840
Ek = 7840-4704 = 3136 Joules.
While Ek goes from 0 to 3136 Joules, the
total energy(Ek+Ep) remains constant at
7840 Joules.
Epmax = F*h = 78.4 * 100 = 7840 Joules.
Ek + Ep = 7840
Ek + 78.4*(100-40) = 7840
Ek + 4704 = 7840
Ek = 7840-4704 = 3136 Joules.
While Ek goes from 0 to 3136 Joules, the
total energy(Ek+Ep) remains constant at
7840 Joules.
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