4. Changing the number of electrons changes the of the atom, which is then called an .

Changing the number of electrons changes the net electric charge of the atom.

If the atom was originally neutral, then it becomes an ion .  (If it wasn't originally neutral, then it was already an ion.)

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~