A block is given an inital speed of 5m/s up a frictionless 20degree incline.
a) how far up the incline does the block slide before coming to rest? Now suppose the lock is released with the same initial speed as in part a) but from the top of the icline and pointed downward.
b) if fricition is now present, what coefficient of kinetic friction would allow the block to still be travelling with speed 5m/s when it reaches the bottom of the incline?