21. A delivery driver drove south 230 km from Sawpit to Gassville. He then turned around and drove back north for 71 km to Mount Carmel. The total trip took 9 hours What was the delivery driver's average speed?"
Average speed
km per hour
"Round your answer to two decimal places if necessary

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

i think the answer is a and b

i wish you luck