2. A projectile is fired with a horizontal velocity of 330 m/s from the top of a cliff 80 m high. a) how long will it take to strike the level ground at the base of the cliff? b) how far from the foot of the cliff will it strike? c) With what velocity will it strike?
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- 2. A child standing at a third story window (25 meters above the ground) throws a baseball at an angle of 30° above the horizontal with an initial velocity of 20 m/s. How far from the building does the ball hit the ground?A rock was thrown horizontally from a 100.0 m high cliff. It strikes the ground 90.0 m from the base of the cliff. a) At what speed was it thrown? b) How long did it take to hit the ground. c) Neglecting wind resistance, which component of velocity is affected by gravity VERTICAL or HORIZONTAL? d) Sketch the trajectory of the rock as it falls to the ground and include the velocity vector at the beginning, midway down, and just before striking the ground. e) After you determine the total time in the air, you can then determine the final vertical velocity vector combined with the horizontal velocity determined earlier. Use these vectors to determine the resultant velocity vector just before landing. Recall using Pythagorean theorem to find the magnitude of the velocity vector and trigonometry for the angle below the horizontal that the resultant vector strikes at.7) A ball is launched upwards from the ground with some initial velocity at an angle of 45° relative to the horizontal. Suppose it travels 30m horizontally before landing again. a) What is its initial launch velocity? b)What is the highest point it reaches?
- Problem 5: A ball is thrown horizontally from the top of a 70 m building and it lands 90 m from the base of the building. a) How long is the ball in the air? b) What must have been the initial speed of the ball? c) What is the vertical component of the ball's velocity just before it hits the ground? d) What is the ball's speed just before it hits the ground?4. A hockey player makes a shot 4m away from goal at a horizontal velocity of 15 m/s. How long does the goalie have to react to the shot?2. A projectile is fired at 12.5 m/s at an angle of 53.1° with the horizontal from a point 75.0 m above the ground. a) What maximum height does it reach? b) with what velocity does it strike the ground?