A 900 kg car accelerates 2 m/s2 to the right. What is the net force acting on the car?

1800 N to the left
450 N to the right
450 N to the left
1800 N to the right

F = m a and acceleration is in the same direction as the net force.

The net force on the car is 1800 N to the right.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."