an object of mass 40 kg is raised to a height of 5m above ground. If object is allowed to fall, find its Kinetic energy when it is half way down. Find its Mechanical energy as well.
Anonymous:
use the formula Mgh
Answers
Answered by
4
mechanical energy = mgh = 40×10×5 =2000J
P. E + K. E = 2000J
at half way
P. E + K. E = 2000
40×10×2.5 + KE =2000J
K. E =1000 J
P. E + K. E = 2000J
at half way
P. E + K. E = 2000
40×10×2.5 + KE =2000J
K. E =1000 J
as at the highest point no kinetic energy is there only p. e is there
achha
tysm
^_^
wlcm
:) dear
by the way which class question is this
??
9th class
okk
Answered by
4
_/\_Hello mate__here is your answer--
_______________________
Given:-
m = 40 kg
g = 9.8 m/s^2
h = 5 m
We know that,
potential energy = mgh
= 40 × 9.8 × 5 J
= 1960 J
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♦♦The total mechanical energy (Kinetic and potential energy) of an object remains constant. (law of conservation of energy)
Therefore, when the object is half-way down, its potential energy become half the original energy and remaining half converted into kinetic energy.
Hence, the kinetic energy = ½ (1960) J = 980 J
I hope, this will help you.☺
Thank you______❤
_________________________❤
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