4) (4 pts) A soccer ball is kicked with an initial horizontal velocity of 10 m/s

Question

4) (4 pts) A soccer ball is kicked with an initial horizontal velocity of 10 m/s and an initial vertical velocity of 12 m/s. Identify the following quantities and include one short sentence to explain your answer using the concepts of projectile motion (no calculations are necessary). Assume that projection and landing height are the same and neglecting air resistance: a. (0.5 pts) The ball's horizontal velocity 0.5 seconds into its flight is: because: b. (0.5 pts) The ball's horizontal velocity midway through its flight is because: c. (0.5 pts) The ball's horizontal velocity immediately before contact with the ground is because: d. (0.5 pts) The ball's vertical displacement up is (circle one) greater than/less than/the same as the vertical displacement down because: e. (1 pt) The ball's vertical velocity halfway through its flight is: because: f. (I pt) The ball's vertical velocity immediately before contact with the ground is: because: Page 3 of 4

Explanation / Answer

a) 10 m/s because it remains constant through the trajectory of a projectile.

b)10 m/s because it remains constant through the trajectory of a projectile.

c) 10 m/s because it remains constant through the trajectory of a projectile.

d)the vertical displacement is Less than down because it for the later one the time doubles and distance is proportonal to the time taken.

e)0 m/s because Halfway of the projectile is the higest point and at highest point the vertical velocity is zero.

f)less than 12 m/s because it reduces with time suring the course of motion.

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