A cannon ball is launched with a speed of 120 m/s at an angle of 30°. a) How fast is the cannonball moving when it reaches the highest point of its trajectory?   b) How fast is the cannonball moving before it strikes the ground?

A ball is thrown horizontally from the top of a building 22m high.the ball strikes the ground at a point 35 m horizontally away from and below the point of release.Air resistant is neglected from this problem.e.what is the speed of the ball just before it strikes the ground?

Three balls are launched simultaneously, as in the figure. The red ball is launched at an initial velocity Vodirected at an angle & above the horizontal. The blue ball is launched vertically with a speed of 10.3 m/s, and the yellow ball is launched horizontally with a speed of 5.20 m/s. The blue and red balls reach identical maximum heights and return to the ground at the same time, and the red ball returns to the ground to meet the yellow ball at the same place along the horizontal. Find (a) the launch speed vo and (b) the launch angle for the red ball. hmax 10.3m/s VO A 5.20 m/s (a) Number i (b) Number i Units Units

An attacker at the base of a castle wall 3.60 m high throws a rock straight up with speed 7.50 m/s from a height of 1.60 m above the ground. a) what is its speed at the top? If not, what initial speed must it have to reach the top? b) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.50 m/s and moving between the same two points. c) 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? d) Explain physically why it does or does not agree.