If a car accelerates at 7.5 mph/s, what would be its final speed after 5.0 seconds if its starting speed were 50mph?

87.5mph

Explanation:

Given parameters:

Acceleration  = 7.5mph/s

Starting speed  = 50mph

Time  = 5s

Unknown:

Final speed  = ?

Solution:

Acceleration is defined as the rate of change of velocity with time:

   Acceleration  =

Insert the parameters and solve;

 7.5  =

  Final speed - 50  = 7.5 x 5

  Final speed  = 7.5 x 5 + 50  = 87.5mph

  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.