1. A .2 kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3 m. A .4 kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is
a. one half the time
b. twice
c. the same
d. four times

2. A ball is thrown at an angle of 38 degrees to the horizontal. What happens to the magnitude of the ball's vertical acceleration during the total time interval that the ball is in the air
a. decreases then increases
b. decreases then remains the same
c. increases then decrease
d. remains the same

3. At what angle should a ball be oriented for maximum height and range?