4. A rock is kicked horizontally from a 500 m high cliff. It strikes level ground 90 m from the base of the cliff. At what speed was it kicked? ans) 5. A soccer ball is kicked at an angle of 30.0 to the horizontal with an initial velocity of 20.0 m/s. Calculate a) the maximum height, b) the 'air-time', c] the horizontal distance travelled (range), d) the velocity vector at the maximum height, and e) the acceleration vector at maximum height dj e ) 6. A stone is projected from the top of a cliff with a speed of 20 m/s at 40 above the horizontal. After 3.0 s, it strikes the ground. Ignore air resistance. a. Find the height if the cliff b. Find the total horizontal distance the stone travels C. Find the maximum height of the stone from the bottom of the cliff a b) c).. A boat heads 30.0 West of North but is blown off course by wind to the East. If the boat's speed relative to still water is 15 m/s and the wind speed is 5 m/s a. Find the boat's resultant velocity (in m/s) and b. How far (distance) the boat will travel in 2 hours. Velocity). Direction) Distance)_ 3. A cannon is fired at 370 to the horizontal. If the initial velocity is 30.0 m/s, a. Find the horizontal distance travelled and b) the time of flight