1. A helicopter is flying at 40 m/s at an altitude of 100 m. If a ball is released from the helicopter, with what velocity will it hit the ground?

 

a. 40 m/s

b. 50 m/s

c. 60 m/s

d. 70 m/s

 

Answer: _____

 

 

2. A cannonball is fired from the ground at an initial speed of 40 m/s at an angle above the horizontal. It takes 2 s for the cannonball to reach its maximum vertical height. What was the angle?

 

a. 10^o

b. 20^o

c. 30^o

d. 40^o

e. 50^o

 

Answer: _____

 

 

3. A rifle bullet is fired from the top of a cliff at an angle of 30° below the horizontal. The initial velocity of the bullet is 800 m/s. If the cliff is 80 m high, how far does it travel horizontally?

 

a. 130 m

b. 140 m

c. 150 m

d. 160 m

 

Answer: _____

 

 

4. A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. It hits the ground in 4.30 s. What is the height of the cliff? (use g = 9.81 m/s²)

 

a. 22.0 m

b. 43.0 m

c. 77.6 m

d. 90.7 m

 

Answer: _____

 

 

5. A projectile is launched with an initial velocity of 60.0 m/s at an angle of 37.0° above the horizontal. What is the maximum height reached by the projectile? (use g = 9.81 m/s²)

 

a. 23.0 m

b. 46.7 m

c. 66.5 m

d. 92.0 m

 

Answer: _____

 

 

6. A soccer ball is kicked with a velocity of 25 m/s at an angle of 45° above the horizontal. What is the vertical component of its acceleration as it travels along its path?

 

a. 9.81 m/s² downward

b. (9.81 m/s²) (sin 45°) downward

c. (9.81 m/s²) (sin 45°) upward

d. (9.81 m/s²) upward

 

Answer: _____

 

 

7. A pilot drops a bomb from a plane flying horizontally. Where will the plane be located when the bomb hits the ground?

 

a. behind and above the bomb

b. over the bomb

c. in front and above of the bomb

d. depends on the speed of the plane when the bomb was released

 

Answer: _____

 

 

8. A stone is thrown horizontally from the top of a tower at the same instant that another stone is dropped vertically. Which object is traveling faster when it hits the ground?

 

a. It is impossible to tell from the information given

b. The first stone

c. The second stone

d. Neither, since both of them will hit the ground at the same time

 

Answer: _____

 

 

9. A ball thrown horizontally from the top of a building 24 m above the ground strikes the ground at the distance of 18 m from the base of the building. What was its initial velocity? (use g = 9.81 m/s²)

 

a. 6.10 m/s

b. 7.40 m/s

c. 8.14 m/s

d. 8.96 m/s

 

Answer: _____

 

 

10. The horizontal and vertical components of the initial velocity of a projectile are 50 m/s and 120 m/s respectively. What is the magnitude of the initial velocity?

 

a. 110 m/s

b. 130 m/s

c. 150 m/s

d. 170 m/s

 

Answer: _____

 

 

11. A bullet is fired at an angle θ above the horizontal with an initial velocity of 800 m/s from the top of an 80 m high tower. What value of θ will give the maximum horizontal range?

 

a. 0°

b. 45°

c. 60°

d. 90°

 

Answer: _____

 

 

12. A stone is thrown with an initial speed of 12 m/s at an angle of 30° above the horizontal from the top edge of a cliff. If it takes the stone 5.60 s to reach the bottom, how far does the stone travel horizontally? Neglect air resistance.

 

a. 58 m

b. 154 m

c. 120 m

d. 197 m

 

Answer: _____