8. A machine launches a tennis ball at an angle of 25° above the horizontal at a

Question

8. A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch? per in f fight of a A) decrease the launch angle and decrease the ball's B) decrease the launch angle and increase the ball's C) increase the launch angle and decrease the D) increase the launch angle and increase the ball's initial speed initial speed initial speed initial speed ball's u il bit into the air has an initial

Explanation / Answer

Ans: (D) increase the launch angle and increase the ball's initial speed.

The time of flight is given by:

t = 2v0sin(th)/g

sin(th) increases with th.

So, increasing v0 and th increases t.

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