A boy of mass 8kg falls from rest from a height of 100m, neglecting air resistance calculate his total energy after fallin down a distance of 40m

Answer 1

his total energy does not change
PE = 8*100

After 100m, it won't matter :-(

Answer 2

I dnt understand

Answer 3

8 * 9.8 * 100

Answer 4

Thanks, Damon. Forgot PE=mgh
Must have thought 8kg was his weight...

Answer 5

4800 J

Answer 6

Thanks for that