Well usually the source for all three (organs to a certain extent; 1 Kidneys, portions of liver, 1 Lung, Skin and or hair) can be taken from a live donor. This usually preferred.
However certain organs such as the heart, or any organ in particular can be gotten from a donor who has experienced brain death to the point where they are clinically dead
How does changing the type of exercise effect heart rate in bpm?
Or
How does changing the amount of reps of [insert exercise here] affect heart rate in bpm?
Answer:
If KE = 0, the pendulum is not moving. At the top of the swing, the pendulum must stop for a brief moment.
Explanation: