Answer:
Barret True, the speed decreases with increasing time
Step-by-step explanation:
The equation they give us to describe the movement is of the form
y = yo + v₀ t + ½ a t²
The given equation is
y = -4 - 9 t + 2 t²
We can match term to term and find the constants
y₀ = -4 m
v₀ = -9 m / s
a = 2 m / s²
With this data we can build the equation of speed and time
v = v₀ + a t
v = - 9 + 2 t
With this expression we see that as time increases the speed decreases since the speed and acceleration have direction is opposite
Now we can analyze the students' observations
Amadeo False, we see that the behavior is the opposite
Barret True, the speed decreases with increasing time
Chinue False With the equation we have all the data to build the speed equation as a function of time