A stone of mass m is thrown straight up and reaches a height of 15 ft. show answer No Attempt At the top, 15 ft up, what is the magnitude of the net force on the stone?

mg      

Explanation:

The only force which acts on the ball is its weight ( ) 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

the answer is d

lies a supermassive black hole called sagittarius a*, or sgr a* for short.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.