Version 036/AACBA – QTest #3 – Antoniewicz – (57420) 1
This print-out should have 4 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
001 (part 1 of 4) 10.0 points
A plane is flying horizontally with speed
287 m/s at a height 1870 m above the ground,
when a package is dropped from the plane.
The acceleration of gravity is 9.8 m/s2.
Neglecting air resistance, when the package
hits the ground, the plane will be
1. behind the package.
2. directly above the package. correct
3. ahead of the package.
Explanation:
Both have the same velocity at the time of
release. Gravitational acceleration does not
change horizontal velocity, so the plane will
be directly above the package.
002 (part 2 of 4) 10.0 points
What is the horizontal distance from the re-
lease point to the impact point?
1. 4596.55
2. 6641.95
3. 5606.67
4. 6237.66
5. 6300.31
6. 7180.97
7. 5067.8
8. 5667.51
9. 4924.2
10. 2621.08
Correct answer: 5606.67 m.
Explanation:
For the vertical fall, h=1
2g t2, or t=
s2h
g. The horizontal distance traveled is
x=v t
=vs2h
g
= (287 m/s)s2 (1870 m)
9.8 m/s2
= 5606.67 m .
003 (part 3 of 4) 10.0 points
A second package is thrown downward from
the plane with a vertical speed v1= 72 m/s.
What is the magnitude of the total velocity
of the package at the moment it is thrown as
seen by an observer on the ground?
1. 286.472
2. 199.612
3. 278.677
4. 251.754
5. 295.894
6. 190.184
7. 184.765
8. 202.608
9. 176.706
10. 162.25
Correct answer: 295.894 m/s.
Explanation:
The velocity is the vector sum of the vertical
and horizontal components of velocity as seen
from the ground. Hence the scalar speed is
s=qv2+v2
1
=q(287 m/s)2+ 72 m/s2
= 295.894 m/s.
004 (part 4 of 4) 10.0 points
What horizontal distance is traveled by this
package?
1. 5694.25
2. 3490.01
3. 2228.61
4. 2134.05
5. 7478.24
6. 3881.49
7. 4481.76
8. 3387.94
9. 3638.33
10. 5162.98
