Answer:
a car slowing from 60 m/s to 0 m/s
Explanation:
Speed is defined as the ratio between the distance covered by an object and the time taken to cover that distance:
[tex]v=\frac{d}{t}[/tex]
A varying speed means that the speed is not constant, but it is changing over time. Let's analyze each option:
a car traveling the speed limit --> NO. The car is travelling always at the same speed, so its speed is constant
a fish moving at 2 m/s for 5 minutes --> NO. The fish is always moving at the same speed, so its speed is constant
a bird flying at 10 m/s for 10 seconds --> NO. The bird is flying always at the same speed, so its speed is constant.
a car slowing from 60 m/s to 0 m/s --> YES. The car is changing its speed from 60 m/s to 0 m/s, so this represents a varying speed.
