Acceleration of a ball on its way up, going at an initial velocity of 20 m/s

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?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.