Name:_______________________________ 4-digit Code Number:_______________________________

- Which of the following statements is correct for an object
released from rest, freefalling in the Earth's gravity? (Neglect
air resistance.) Circle
**all**true statements.- the object falls 9.8 m during the first second of time
- during each second the object falls 9.8 m
- the average speed during the first second of time is 4.9 m/s
- the acceleration changes by 9.8 m/s
^{2}every second - the acceleration of the object is proportional to its weight

- Consider the following graphs (note the axes carefully). Which
of these represent one-dimensional motion at constant speed?
Circle
**all**that apply.

- I.
- II.
- III.
- IV.
- V.

- A golfer drives a golfball in a high arcking trajectory, a parabola
that is concave down. The range is non-zero. Neglect air resistance.
When the ball is at the highest point in its flight,
- its velocity and acceleration vectors are both zero.
- its velocity vector is zero, but its acceleration vector is nonzero.
- its velocity vector is nonzero, but its acceleration vector is zero.
- its velocity and acceleration vectors are both nonzero.
- none of these.

- A projectile fired vertically upward from ground level is in the
air for 6.00 seconds before returning to the ground. What was the
speed of the projectile at launch? Use g = 9.80 m/s
^{2}.

- Solve these equations for v
_{ox}in terms of x_{f}, y_{f}, and a_{y}by eliminating t.

y _{f}= ½ a_{y}t^{2}

x_{f}= v_{ox}t

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