Answer:
mg
Explanation:
The only force which acts on the ball is its weight ( [tex]mg[/tex]) once it is thrown.
The weight acts downwards.
When the stone is thrown up, the final velocity at the maximum height is zero.
Initial velocity can be found by using law of conservation of energy.
Kinetic energy at the bottom = potential energy at the top
0.5 m v² = mgh
[tex]v=\sqrt{2gh}\\v = \sqrt {2\times 32.2 ft/s^2\times 15 ft}=31.1 ft/s[/tex]
