3. if a car accelerates from rest at a constant 5.5 m/s, how long will it take for the car to reach a
velocity of 28 m/s?

2.54 s

Explanation:

If we are talking about a constant acceleration, we can use the following equation:

Where:

is the final velocity of the car

is the finitial velocity of the car (it started from rest)

is the constant acceleration of the car

is the time it takes to reach with the given constant velocity

Hence:

Clearing :

Finally:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.