In january 2004, nasa landed exploration vehicles on mars. part of the descent consisted of the following stages: stage a: friction with the atmosphere reduced the speed from 19300 km/h to 1600 km/h in 4.0 min. stage b: a parachute then opened to slow it down to 321 km/h in 94 s. stage c: retro rockets then fired to reduce its speed to zero over a distance of 75 m. assume that each stage followed immediately after the preceding one and that the acceleration during each stage was constant.

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car a and b are moving in opposite directions

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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.