the break dancers speed is not changing as he spins on his head, but he is accelerating. explain how this could be.

What practical value did astronomy offer to ancient civilizations?

Water moves to the top of tall trees because of a) capillary action b) surface tension c) capillary action and evaporation d) vapor pressure

Suppose an object in free fall is dropped from a building. its starting velocity is o m/s. what is the speed (in m/s) of the object falling after 2 seconds?