1. Our most common frame of reference is the
A. atmosphere C. moon
B. Earth
D.sun
2. Motion is measured by
A. distance
B. distance and direction
C. time
D. time and distance
3. The rate of change in velocity is called
A. acceleration
B. average velocity
C. constant speed
D. distance
4. What is the formula for speed?
A. Distance moved + time taken
B. Distance moved X time taken
C. Distance moved + time taken
D. Time taken - distance moved
5. It measures how fast in a given direction
A. acceleration C. speed
B. distance
D. velocity​