taylorleeanneho taylorleeanneho

09-08-2016
Physics

contestada

An 1800kg car is traveling on an elevated roadway 5.0 meters above the ground. If the car is moving at 20 m/s, what is the total mechanical energy of the system?

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Hanibal Hanibal

11-08-2016

We know that:
EM=Ek+Epg
SO:
Ek=1/2mv²
Ek=1/2(1800kg)(20m/s)²
Ek=360000J
Now:
Epg=mgh
Epg=(1800kg)(9,81m/s²)(5m)
Epg=88290J
We sum:
EM=360000J+88290J
EM=448290J

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