If 100 kg Mr Halpin is coasting along to the north and he picks up his 4 kg backpack, what was his velocity before picking up his backpack if he is going 3.5 m/s to the north after picking it up?

As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is 100) a) static friction. b) kinetic friction. c) a combination of static and kinetic friction. d) neither static nor kinetic friction, but some other type of friction. e) it is impossible to tell what type of friction acts in this situation.

In science and physics what is the standard unit of measure for speed?

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)