A car travelling at a constant speed of 70km/h passes a stationary police car. The police car immediately gives chase, accelerating uniformly to reach a speed of 85km/h in 10s and continues at this speed until it catches the other car.
(A) Find the time taken for the police car to catch up with the Car.
(B) Find the distance travelled by the police car when this Happens.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

  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.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000