alleryStart learning →A marble rolls 5.2 m in 1.8 s. What is its average speed?
A0.35 m/s
B1.8 m/s
C2.9 m/s
D9.4 m/s
Answer & Solution
Correct answer: C. 2.9 m/s
1. Average speed is distance divided by time.
2. v = 5.2 m / 1.8 s = 2.9 m/s.
3. 9.4 m/s comes from multiplying the two numbers instead of dividing, and 0.35 m/s comes from inverting the division.
_Source: OpenStax Physics (CC BY 4.0), Ch 2 "Motion in One Dimension", section 2.2 Speed and Velocity_
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