1. Three vehicles are traveling at the same speed in the same direction on a 1 point highway, as shown in the diagram below. If the position of the front of the
white van is -21 m, what is the point of reference?

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  The front of the black car

Explanation:

The position -21 is shown on the diagram at the front of the white van. The reference point is the position 0, which is shown on the diagram as the front of the black car.

Explanation:

I'm answering this just so you can give the Brainliest to Squaredancefan, a master answerer in my opinion.

The reference point is where the 0 is. Everything to the right is positive and everything left of 0 is minus. 0 is the reference point because it is neither.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s