The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 grams. the velocity of the stone when it reached the target was 15.0 meters/second. what was the value of the kinetic energy of the stone when it reached the target? 2.05 joules 2.25 joules 3.20 joules 4.43 joules

Answer : The correct option is, 2.25 joules.

Explanation : Given,

Mass of the stone = 20 g

Velocity of the stone = 15 m/s

Formula used for kinetic energy is :

where,

K.E = kinetic energy of the stone

m = mass of the stone

v = velocity of the stone

Now put all the given values in this formula, we get the kinetic energy of the stone.

Therefore, The kinetic energy of the stone is, 2.25 joules.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..