A 23kg ball at the top of the hill falls 168 m to the
ground below. Assuming the drop starts from rest and ignoring drag force,
what is the speed of the ball just before it reaches the bottom?
Identify the forces:
Kinetic Initial
Kinetic Final
Potential Initial
Potential Final
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m(mass of the ball)=23kg
h(height)=168m
wkt, v²-u²=2gh
v²-(0)²= 2×9.8×168
v²=3292.8 J
v²=3293 J (rounding off for simpler calculation)
1) Kinetic initial= 1/2mu²
=1/2×23×0
= 0 J
2) Kinetic final= 1/2mv²
= 1/2×23×3293
= 38786.5 J
3) Potential initial= mgh
= 23×9.8×168
= 37867.2 J
4) Potential final= mgh
= 23×9.8×0
=0
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