The diagram shows the path of a ball in the absence of air resistance. Q is the highest point of the ball's trajectory and a is the vertical acceleration at Q. At impact the velocity makes an angle θ to the horizontal.
Three statements about the actual motion of the ball when there is air resistance are:
I. Q is lower.
II. a remains the same.
III. θ increases.
Which statements are correct?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III