Goldie goldfish, a speed swimmer, loves to race around the park's pond, which is 0.5 miles around. if she can swim 20 laps around the track in 2 hours, what is har average speed?

The average speed is 5 miles per hour

Solution:

Given that, swimmer, loves to race around the park's pond

The park is 0.5 miles around

She can swim 20 laps around the track in 2 hours

To find: Average speed

From given statement,

Each lap is 0.5 miles

Thus total distance covered in 20 laps is given by:

Total distance = 0.5 x 20 = 10 miles

Given that she can swim 20 laps around the track in 2 hours

Total time taken = 2 hours

The Average speed is given by formula:

Thus average speed is 5 miles per hour

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.