please help with this ques. a body of mass 2kg falls from rest and has a k.e of 2000j just before touching the ground.neglecting friction,calculate the height from which the body has fallen.
2007-01-11 12:47:41 · 3 answers · asked by shelly 3 in Science & Mathematics ➔ Physics
Gravitational Potential energy equation is
PE = weight x height
In an ideal environment, all P.E. will turn into K.E.
the weight = mass x gravtional pull
If we estimate the pull of gravity on earth to be 10 N/kg
Then
weight = 2 kg x 10 N/kg = 20 N
Back to the first equation:
PE = weight x height
height = PE/weight
= 2000/20N
= 100 m.
2007-01-11 12:57:33 · answer #1 · answered by borscht 6 · 0⤊ 1⤋
7 feet
2007-01-11 20:50:35 · answer #2 · answered by pop c 2 · 0⤊ 0⤋
answer your own homework questions........be sure to show your work
2007-01-11 20:50:25 · answer #3 · answered by six_foot_2_midget 5 · 0⤊ 0⤋