When acceleration is constant, the average velocity is given by

where  and
 and  are the final and initial velocities, respectively. By definition, we also have that the average velocity is given by
 are the final and initial velocities, respectively. By definition, we also have that the average velocity is given by

where  are the final/initial displacements, and
 are the final/initial displacements, and  are the final/initial times, respectively.
 are the final/initial times, respectively. 
Take the car's starting position to be at  . Then
. Then

So we have

You also could have first found the acceleration using the equation

then solve for  via
 via

but that would have involved a bit more work, and it turns out we didn't need to know the precise value of  anyway.
 anyway.
 
        
             
        
        
        
a). Water is still H₂O after it freezes.
b). Ice is still H₂O after it melts.
c). Wire is still Cu when it's bent.
d). Paper combines with the O₂ in the air, and turns into 
     a lot of new compounds when it burns.
        
             
        
        
        
On behalf of the state, write an invitation for the siblings for the gala dinner 
Hello there, we would like to welcome you to the gala dinner hope you can come :)
 
        
             
        
        
        
Answer:
a) 



b) 
Explanation:
From the exercise we got the ball's equation of position:

a) To find the average velocity at the given time we need to use the following formula:

Being said that, we need to find the ball's position at t=2, t=2.5, t=2.1, t=2.01, t=2.001



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b) To find the instantaneous velocity we need to derivate the equation 


 
        
             
        
        
        
Explanation:
a) Density is the amount of mass in a specific amount of volume
b) Some substances are less dense than water so will float and vice versa 
c) The wooden plank has less density than water due to having larger volume and vice versa with the wooden block since volume and density are inversely proportional
II) (a) They are all metals 
(b) water -> Compound 
oxygen -> Element 
Gold-> Element 
Salt-> Compound