Arace car has a speed of 80 m/s when the driver releases a drag parachute. if the parachute causes a deceleration of 4m/s^2, how far will the car travel before it stops?

The car travels 800m

Explanation:

We will need two formulas to solve this question:

We can obtain the the time by using the final velocity formula and replacing with known values:

Since we know the time, the question will be answered by inputing all the variables needed in the distance formula:

the answer is b, have negligible mass

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.