A car is traveling in the velocity of 20 m/s. After 30 sec it covers a distance of 1200 m. Calculate the acceleration of the car and the final velocity of the car.

Acceleration = 1.333ms-2                     Final velocity = 60ms-1

Explanation:

Final velocity is worked out with the equation s = 1/2 (u+v) t

Acceleration is worked out with the equation s =ut + 1/2at²

Initial velocity = 20ms      displacement = 1200m    time = 30s

Acceleration :   1200 = (20 x 30) + 1/2 a x 30²

                         1200 = 600 + 1 /2 x a x 900

                         1200 = 600 + 450 x a

Final velocity : 1200 = 1 /2 (20+60) x 30

                        1200 = 1/2 x 80 x 30                    

                        1200 = 40 x 30   or  1200 = 1/2 x 2400

think its the third option

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