Suppose that you drive the 10.0 km from your university to home in 20.0 min. what is your average speed in kilometers per hour?

Average speed will be 30.30 m/sec

Explanation:

We have distance d = 10 km

Time to reach university to home = 20 min

We know that 1 hour = 20 min

So 20 minute

We have to find average speed

We know that distance = speed × time

So

So the average speed will be 30.30 m/sec

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

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.