Answer Happy

I feel pretty lost on this one. I don't think my first answer iscorrect, which if true, would mean I cannot solve B and C becauseof that. Could someone please help me?
A ball is kicked with an initial velocity of 11 m/s in the horizontal direction and 15 m/s in the vertical direction. (Assume the ball is kicked from the ground. For each answer, enter a number.) (a) At what speed (in m/s) does the ball hit the ground? 165 m/s + (b) For how long (in s) does the ball remain in the air? S (c) What maximum height (in m) is attained by the ball? m