1. Which formula is dimensionally with an expression yielding a value for velocity?
   (a is acceleration, x is distance, and t is time)
   • v/t²
   • vx²
   • at
   • v²/t

2. In mechanisms, physicists use three basic quantities to derive additional quantities. Mass is one of the three quantities. What are the other two?
   • length and force
   • power and force
   • length and time
   • force and time

3. When NASA was communicating with astronauts on the moon, the time from sending on the Earth to receiving on the moon was 1.28 s. Find the distance from Earth to the moon. (The speed of radio waves is 3.00 X 10⁸ m/s).
   • 240 000km
   • 384 000km
   • 480 000km
   • 768 000km

4. Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
   • The greater mass hits the ground first
   • Both objects hit the ground together
   • The smaller mass hits the ground first
   • No conclusion can be made with the information given

5. The slope of the acceleration vs time curve represents
   • the velocity
   • the rate of change of acceleration
   • the rate of change of displacement
   • the area under the position vs time curve

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