A blue ball is thrown upward with an initial speed of 22.8 m/s, from a height of 0.7 meters above the ground. 2.8 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 9.9 m/s from a height of 29.5 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s2. 1) What is the speed of the blue ball when it reaches its maximum height?
0
m/s
2) How long does it take the blue ball to reach its maximum height?
2.35
s
3) What is the maximum height the blue ball reaches?
27.22242
m
4) What is the height of the red ball 3.64 seconds after the blue ball is thrown?
17.7290323
m
5) How long after the blue ball is thrown are the two balls in the air at the same height?
4
s
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6) Which plot correctly shows the velocity of the two balls as a function of time? Three plots of velocity vs time for the red and blue balls
A
B
C

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

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.