Bill throws a tennis ball to his dog. he throws the ball at a speed of 15 m/s at an angle of 30° to the horizontal. assume he throws the ball from ground level.
a. if bill and his dog start in the same place, how fast should his dog run to intercept the ball exactly as it lands on the ground? (2 points)
b. how fast should the dog run to get to where the ball will be at a height of 2m as it falls back toward the ground, and to get there 0.5 seconds before the ball gets there? (hint: in this problem, you will need to consider both the x- and y-coordinates of the ball's position.) (1 point)