Hi,
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Have a nice day!
At the highest point: kinetic energy is 0 due to the speed is 0
So the total mechanical energy is 20
Assume no frictions present, then the mechanical energy is conserved
So at the lowest point, kinetic energy = mechanical energy - potential energy
Answer will be 20 - 0.5 = 19.5 J
You could get sick by breathing throw your mouth and you have a less chance of getting sick by breathing throw your nose.
Water boiling is an example of a physical change. The rest are chemical changes.
Hope that helps!!
