Acar moves in a straight line at 20.0 m/s for 12.0 miles, then at 30.0 m/s for another 12.0 miles.
(a) is the car's average speed less than, greater than, or equal to 25.0 m/s?
less than 25.0 m/s
equal to 25.0 m/s
greater than 25.0 m/s

(b) calculate the car's average speed. (enter your answer to three significant figures.)

(a). The average speed less than 25.0 m/s.

(b). The  car's average speed is 24 m/s.

Explanation:

Given that,

Speed v= 20.0 m/s

Distance d= 12.0 miles

Speed v'= 30.0 m/s

Distance d'=12.0 miles

We need to calculate the time for first 12 miles distance

Using formula of time

We need to calculate the time for another 12 miles distance

Using formula of time

We need to calculate the average speed

Where, D = total distance

T = total time

Put the value into the formula

The average speed less than 25.0 m/s.

(b). The  car's average speed is 24 m/s.

Hence, This is the required solution.

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

conduction, convection, radiation