The average speed of a moving object during a given interval of time is always:
A. The magnitude of its average velocity over the interval
B. The distance covered during the time interval divided by the time interval
C. One-half its speed at the end of the interval
D. Its acceleration multiplied by the time interval
Which of the following is a substance?
A. Sea water
B. Brass
C. Tape water
D. Graphite
An atom is_____________?
A. Smallest indivisible particle in an element
B. Smallest particle of an element which can undergo a chemical reaction
C. Building block of an element
D. Always smaller than molecule