projectilemotion


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projectilemotion

1. An eagle is flying due east at 8.9 m/s carrying a gopher in its talons. The gopher manages to break free at a height of 12m. What is the magnitude of the gopher's velocity as it reaches the ground ? Use the pythagorian theorem. V**2 = Vox**2 + Voy**2

22 m/s
18 m/s
11 m/s
9.8 m/s
8.9 m/s

2. A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10m/s . The instant before the stone hits the ground, it is traveling at a speed of 30 m/s . If the physics student were to throw the stone horizontally outward fromt he cliff instead, with the same initial speed of 10 m/s, what is the magnitude of the velocity of the stone before it hits the ground ? use again V**2 = vx**2 + Vy**2

10m/s
20 m/s
30 m/s
40 m/s
the height of the cliff must be specified to answer

3. A tennis ball is thrown from the ground level with velocity Vo directed 30 degrees above the horizontal/ It it takes 1.0 s to reach the top of the trajectory, what is the magnitude of the inital velocity ? Use Vy = Vo sin (30)

4.9 m/s
9.8 m/s
11.3 m/s
19.6 m/s
34.4 m/s

4. A cannon ball is aimed 30 degrees above the horizontal and is fired with an initial speed of 125m/s at ground level. How far away the cannon hit the ground?

125m
138m
695m
1040m
1380m

5. A football is kicked with a speed of 18m/s at an angle of 65 degrees above horizontal. What are the respective horizontal and vertical components of the initial velocity of the football ?

7.6 m/s, 16m/s
16 m/s, 7.6 m/s
8.4 m/s, 13 m/s
13 m/s, 8.4 m/s
9 m/s, 9 m/s

6. A football is kicked with a speed of 18m/s at an angle of 65 degrees above horizontal. How long is the football in the air ?

1.1s
1.6s
2.0.s
3.3s
4.0s

7. A football is kicked with a speed of 18m/s at an angle of 65 degrees above horizontal. How far does the football travel horizontally before it hits the ground ?

18m
25m
36m
48m
72m

8. A ball is fired at an angle of 45 egrees, the angle that yields the maximum range in the absence of air resistance. What is the ratio of the ball's maximum height to its range ?

1.0
0.75
0.67
0.5
0.25

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