29. A ball is thrown straight down from a window 15 m above the ground at a speed of 8 m/s. Assuming no air resistance, how fast will the ball be moving just before it hits the ground? 30. A ball is thrown from a height of 2m above the ground with an initial velocity of 25 m/s at angle of 50 degrees above the horizontal. What is the maximum height above the ground that the ball will reach? Assume no air resistance. 31. A 200 g ball is placed on top of a vertical spring attached to the ground and pushed down against the spring so that the spring is compressed by 12 cm. When the system is released, the ball flies up off the spring and rises to a maximum height of 70 cm above its initial position at rest on the compressed spring. What is the spring constant of the spring? 32. What is the moment of inertia of an 800 g meter stick about an axis perpendicular to the meter stick and passing through the 30cm mark? (Note that the moment of inertia of a rod about an axis perpendicular to the rod and through its center of mass is (1/12) ML?. 33. A block sits at rest on a table. What is the Newton's Third Law pair to the force of gravity on the block? Answer in a three-word-description '(object) on (object)' where you fill in the names of the objects