The speed of Usain Bolt ( quickly search online for it if you don’t know who this guy is). Try to discuss about how fast he runs in a unit (such as mile per hour) you are familiar with.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

c) up is the direction the magnetic force is acting on the charge.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this