In the series of questions that follow, (1, 2, 3 and 4), assume that the magnitude of the acceleration of gravity is exactly 10.0 m/s² and that there is no friction with the air. A bored golfer standing on a flat, horizontal section of the golf course hits a small stone with his club so that the horizontal and vertical components of its velocity as it leaves the ground are 20.0 m/s and 15.0 m/s respectively.

When the stone is at the top of its trajectory, its speed is ___ m/s.

When the stone is at the top of its trajectory, the magnitude of its acceleration is ___ m/s².

The time required for the stone to reach the highest point in its trajectory is ___ s.

The horizontal distance traveled by the stone before it hits the ground is ___ m.

The following sentence pertains to questions 5-8.

A projectile is launched from ground level with speed v_o at an angle _o above the horizontal.

If v_o was increased slightly, the range of the projectile would ___.

If _o was increased slightly, the time the projectile spends in the air before hitting the ground would ___.

If v_o was increased slightly, the maximum height attained by the projectile would ___.

If _o was decreased slightly, the range of the projectile would ___.