What is the science behind potato powering a lightbulb? ? keep it simple.

Which describe reflection? check all that apply. light bounces off a boundary.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.