Which units are used to measure both velocity and speed check all the apply

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?