H2P-121
Describing motion
H2 Physics · JC 1 · Medium · Describing motion
A runner travels at 4.0 m s⁻¹ for 20 s and then at 6.0 m s⁻¹ for 10 s in a straight line. What is the runner’s average speed over the whole 30 s?
- 4.7 m s⁻¹
- 5.0 m s⁻¹
- 4.0 m s⁻¹
- 6.0 m s⁻¹
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