Serving at a speed of224km/h, a tennis player hits the ball at a height of2.6m and an anglebelow the horizontal. The service line is11.9 mfrom the net, which is0.91 mhigh. What is theanglesuch that the ball just crosses the net? Will the ball land in the service box, whose out line is6.40 mfrom the net?

2)

A ball is thrown horizontally from the top of a 51.0-m building and lands 117.8 m from the base of the building. Ignore air resistance. (Assume the ball is thrown in the +x direction and upward to be in the +y direction.)(a)How long (in s) is the ball in the air?

What must have been the initial horizontal component of the velocity (in m/s)? (Indicate the direction with the sign of your answer.)

(c)What is the vertical component of the velocity (in m/s) just before the ball hits the ground? (Indicate the direction with the sign of your answer.)

What is the velocity (in m/s) (including both the horizontal and vertical components) of the ball just before it hits the ground?

3)

Near the end of a marathon race, the first two runners are separated by a distance of45.0m. The front runner has a velocity of3.45m/s,and the second a velocity of4.25m/s.(a)

What is the velocity (in m/s) of the second runner relative to the first?

m/s faster than the front runner

If the front runner is 250 m from the finish line, who will win the race, assuming they run at constant velocity?

The second runner will win.The first runner will win.

(c)

What distance (in m) ahead will the winner be when she crosses the finish line?