Question 2: When an arrow is shot from the bow, it has kinetic energy. From where does it get the KE?
ANSWER
The arrow is fitted in the string of the bow. The string is pulled backward. Doing so, work is done against the restoring elastic force of the string of the bow. This work is stored in the string as elastic potential energy.
At the time of shot, the string is released. The potential energy of the string is converted to the kinetic energy. As the arrow is fitted in with the string, it also gains the KE. When released from the bow, the arrow goes with high KE from the string in the forward direction.
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