A boy is practicing tennis by hitting a ball at a wall. He hits the ball at 0.91 m above the ground. The initial speed of the ball is 19.0 m/s at an initial angle of 32° above the horizontal
(a) How long does it take for the ball to hit the wall if it is 6.9 m away?
(s)
(b) How high is the ball when it hits the wall?
(m)