So, I've already answered parts (b) and (c), but I'm struggling with (d). Thanks in advance for any help! 1. The problem statement, all variables and given/known data "A woman throws a ball at a vertical wall d = 6.0 m away. The ball is h = 3 m above ground when it leaves the woman's hand with an initial velocity of 16 m/s at 45°. When the ball hits the wall, the horizontal component of its velocity is reversed; the vertical component remains unchanged. (Ignore any effects due to air resistance.) (d) How long was the ball in the air after it left the wall?" I've got the height when the ball hits the wall hw= 7.62 m, and the time it took for the ball hit to the wall t = 0.53 sec. I know these are right because they've been graded as such. 2. Relevant equations I think the relevant equation is [tex] y = y_0 + v_0t+1/2 g t^2 [/tex]. 3. The attempt at a solution I've set y= -7.62, y0=0, and 1/2 g = -4.905; solve for t using the quadratic formula. I'm treating it as if it's a different problem after the ball hits the wall, so it's independent of whatever happens before the ball hits the wall. I don't know if that's right, but it made sense to split the whole problem into two parts: before the ball hits the wall, and after the ball hits the wall.