1) A student driving her 1.60 x 102 kg car at 50.0 km/h presses on the gas pedal and accelerates to 90.0 km/h in 12.0 s. What is the average net force applied by the car’s engine during this time interval? 2) v=vf-vi, f=ma, a=v/t 3) i found v by subtracting 90.0km/h by 50.0km/h. i also converted 12.0s to hours which gave me 0.003 repeated. Then i tried finding acceleration by dividing 40km/h by time. then i plugged that in the force formula and multiplied it by 1600kg, but when i find my answer, it is not one of the answers i can chose from.