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Answer:
<em>The average speed is 22.2 km/h</em>
Explanation:
<u>Average Speed</u>
Given an object travels a total distance d and took a total time t, then the average speed is:
The mailman first drives d1=7 km at v1=15 km/h. The time taken to drive is:
Then he drives d2=7 km at v2=43 km/h taking a time of:
The total time is
t=0.467 h + 0.163 h = 0.63 h
The total distance is
d = 7 km + 7 km = 14 km
The average speed is:
The average speed is 22.2 km/h
Thus, machines that extract energy from finite sources will not operate indefinitely, because they are driven by the energy stored in the source, which will eventually be exhausted. A common example is devices powered by ocean currents, whose energy is ultimately derived from the Sun, which itself will eventually burn out<span>. Machines powered by more obscure sources have been proposed, but are subject to the same inescapable laws, and will eventually wind down.</span>
The net force in the tug of war which is shown in the picture provided will be 0N.
<h3>What is a Force?</h3>
This is defined as the power exerted on a body and the unit of Force is referred to as Newton.
In the tug of war, the net force is gotten by summing up all the forces.
–190N + 10N –10N + 190N = 0N.
Therefore the net force is 0N.
Read more about Force here brainly.com/question/12970081
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