Formula:
Speed = Distance ÷ Time
Solution:
Speed = 60 ÷ 20
= 3km/min
Considering the definition of speed, the speed of Sam is 3.6
.
<h3>Definition of speed</h3>
Speed is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.
The speed can be calculated using the expression:

<h3>Speed of Sam</h3>
In this case, you know:
- displacement= 9 km
- time= 2.5 h
Replacing in the definition of speed:

Solving:
<u><em>speed= 3.6 </em></u>
Finally, the speed of Sam is 3.6
.
Learn more about speed:
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Answer:
A
Explanation:
Energy is stored inside the batteries. Thus it is chemical potential energy