Which type of signal is has a step-like appearance because it is composed of precise values of "this or that" with nothing between them? Options:

Digital signals

Dial-up internet

Vinyl records

Analog signals

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?