Which explains the information needed to calculate speed and velocity?
Both require the total distance, but velocity also requires time and displacement.
Both require time, but velocity requires displacement and speed requires distance.
Speed requires displacement, while velocity requires distance.
Speed does not require time, while velocity does require time.
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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.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.