An attacker at the base of a castle wall 3.55 m high throws a rock straight up with speed 8.30 m/s from a height of 1.60 m above the ground. (a) Will the rock reach the top of the wall? Yes O 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 8.30 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? O Yes No (e) Explain physically why it does or does not agree.

A basketball is tossed vertically up into the air from the edge of a roof 8.5 m above the ground. First, if the ball took 1.6 seconds from the point when released upward until it hit the ground, what was the ball's initial speed? Second, what was the greatest height reached by the ball with respect to the roof? Ignore air resistance and use a value of g = 10.0 m/s when answering this question. B IU A + v ... Paragraph 65% 72°F $C# ス lili

From a clifftop over the ocean 130 m above sea level, an object was shot straight up into the air with an initial vertical speed of 166.6 ms On its way down it missed the cliff and fell into the ocean. Its height (above sea level) as time passes can be modeled by the quadratic function f, where f(t)=−4.9t^2+166.6t+130 Here t represents the number of seconds since the object’s release, and f(t) represents the object’s height (above sea level) in meters.   1) After this, this object reached its maximum height.   2) This object flew before it landed in the ocean.   3) This object was above sea level 24s  after its release.   4) This object was 1526.5 m above sea level twice: once after its release, and again later after its release.