Explanation:
What exactly are u looking for?
Weight equals mass times gravitational acceleration=400N, so mass=400/9.8=41kg approx.
The physical changes are you are breaking down the food u eat and the chemical changes are when the enzymes in your stomach break down the food that you have already eaten
ANSWER; KE=5mv^2 so it is proportional to v^2.
Explanation:So if you triple the velocity you are replacing v with 3v. Then you get (3v)^2=9v^2.
