If you drop a rock from a height of 13 m, it accelerates at 9.8 m/s2
and strikes the ground
1.62882 s later.
If you drop the same rock from half that
height, what will be its acceleration?
1. the same.
2. about half.
3. Unable to determine.
4. more.
5. 0.

The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy is nuclear

These models show the electron structures of two different nonmetal elements. which element is likely more reactive, and why? element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table. element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table. element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons. element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

Aball is thrown upward in the air, and its height above the ground after t seconds is h ( t ) = 57 t − 16 t 2 feet. find the time t when the ball will be traveling upward at 14.25 feet per second.