3. A soccer ball is kicked with an initial horizontal velocity of 5 m/s and an i

Question

3. A soccer ball is kicked with an initial horizontal velocity of 5 m/s and an initial vertical velocity of 3 m/s. Assuming that projection and landing height are the same and neglecting air resistance, identify the following quantities: a. The ball’s horizontal velocity 0.5 seconds into its flight b. The ball’s horizontal velocity midway through its flight c. The ball’s horizontal velocity immediately before contact with the ground d. The ball’s vertical velocity at the apex of its flight e. The ball’s vertical velocity immediately before contact with the ground

Explanation / Answer

a)

The ball’s horizontal velocity 0.5 seconds into its flight

the horizontal velocity no change

horizontal velocity = 5 m/s

b) The ball’s horizontal velocity midway through its flight

at any point the horizontal velocity no change

horizontal velocity at midway = 5 m/s

c) The ball’s horizontal velocity immediately before contact with the ground

at any point the horizontal velocity no change

horizontal velocity immediately before contact with the ground 5 m/s

d)

The ball’s vertical velocity at the apex of its flight

at maximum height the velocity is zero

v = 0

e) The ball’s vertical velocity immediately before contact with the ground

before contact with the ground the opposite direction of initial vertical velocity

final vertical speed v = - 3 m/s

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