A ball is thrown vertically upwards from the ground at a speed of 15.0 m/s. What will be its velocity at a height of 4.00 m (in m/s)?     hint: there will be two answers. Type both in the box (in meters)

A projectile is launched in the air from the ground with initial velocity ?0=66 m/s.�0=66 m/s. What is the maximum height the projectile reaches

An attacker at the base of a castle wall 3.80 m high throws a rock straight up with speed 8.40 m/s from a height of 1.40 m above the ground. (a) Will the rock reach the top of the wall? Yes, No     (b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top? m/s(c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.40 m/s and moving between the same two points. m/s(d) Does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? Yes, No     (e) Explain physically why it does or does not agree.

An object is thrown upwards from the ground level at a speed of 58m/s. It travels upwards to the highest point of its path and then falls back to the ground. What is the objects speed and direction right as it is about to hit the ground at the end of it's fall? *   24 m/s upwards 24 m/s downwards 0 m/s upwards 9.8 m/s upwards 9.8 m/s downwards 58 m/s upwards 58 m/s downwards