From a hovering helicopter, a 40kg crate of supplies is thrown to the ground with a velocity of 3m/s. If the crate reaches the ground 43m below with a velocity of 22.1m/s, determine the
energy lost to friction.

Some type of thing that was invisible

Supply is the markets term for selling a specific quantity of products at various prices. the law of supply and demand is the one which affect the pricing and also the quantity the market is able to produce or make available.

I'm pretty sure the answer is c 

False  i read once that you can't do more than two activities at once