A ball of mass 8 kg fall from rest from a height of 100m neglecting air calculate it's total energy after falling distance of 40m
4 answers
total energy measured from what reference position. Think about that.
ho = 100 m above gnd.
h = 100-40 = 60 m above gnd.
KE = PE = Mgh = 8*9.8*60 = 4704 Joules.
h = 100-40 = 60 m above gnd.
KE = PE = Mgh = 8*9.8*60 = 4704 Joules.
surely, KE gained = PE lost = 40mg
PE retained = 60mg
so total energy is still the 100mg it started with
PE retained = 60mg
so total energy is still the 100mg it started with
Correction: Please disregard my first post; I agree with oobleck's analysis:
The total energy does not change.
The total energy does not change.
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