A ball is thrown upward from the top of a 160-ft building. If y(t) = 160 + 48t -16t is its equation of motion where t=0 is time (sec) and y(t) is altitude (ft) above the ground; also, the velocity of the ball is v(t) = 48 - 32t : a). when does the ball hit the ground (t = ?):

b). the maximum height of the ball is y = ?: