What is the difference between research in the field and in the field and in the laboratory

Awalk up the phase change graph worksheet

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

What does si stand for,when referring to a system of measurement