## Physics Help >> Index to Physics Homework Help » Projectile Motion Quiz 2

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 1

For projectiles thrown at an angle upward between vertical and horizontal, and considering air resistance to be negligible, which of the following is true:

a. The horizontal component of the velocity is the same throughout its flight.

b. The acceleration decreases as the projectile moves upward.

c. The speed is minimum at the highest point in its trajectory.

d. The acceleration is zero at the highest point in its trajectory.

e. The velocity is zero when the projectile is at its maximum height.

1. a and e

2.b and c

3. c and d

4. a and c

5. all of the above

6. none of the above

Write the number of the best choice here:

 2
A stone is thrown with an initial speed of m/s at an angle of º above the horizontal from the top of a m tall building. Neglecting air resistance, what is the magnitude (in m/s) of the vertical component of the rock's velocity as it hits the ground?

 3
A girl runs straight off a cliff with a horizontal velocity of m/s and falls for s before landing on the ground. What is the horizontal component of her velocity (in m/s) just before she reaches the ground?

 4
How far from the cliff (in m) does the girl in the previous question hit the ground?

 5
A girl runs straight off a cliff with a horizontal velocity of m/s and falls for s before landing on the ground. What is the vertical component of her velocity (in m/s) just before she hits the ground?

 6
How high was the cliff (in m) in the previous question?

 7
What was the girl's acceleration (in m/s/s) just before the she reached the ground in the previous question?

 8
An artillery shell is fired from a cliff m above a valley with a velocity m/s at an angle º above the horizontal. How many seconds after being fired does the shell reach its maximum height?

 9
What is the maximum height of the shell in the previous question (in m) above the valley floor?

 10
An artillery shell is fired from a cliff m above a valley with a velocity m/s at an angle º above the horizontal. How far (in km) has the shell traveled horizontally when it is at its maximum height?

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