Asked by Wisdom

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
Answered by bobpursley
total energy measured from what reference position. Think about that.
Answered by henry2,
ho = 100 m above gnd.
h = 100-40 = 60 m above gnd.
KE = PE = Mgh = 8*9.8*60 = 4704 Joules.
Answered by oobleck
surely, KE gained = PE lost = 40mg
PE retained = 60mg
so total energy is still the 100mg it started with
Answered by henry2,
Correction: Please disregard my first post; I agree with oobleck's analysis:
The total energy does not change.

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