Physics 0625 · IGCSE · Motion

Motion — practice question

An athlete travels at a speed of $8\,\text{m s}^{-1}$ for $10\,\text{s}$, then moves at $6\,\text{m s}^{-1}$ for $12\,\text{s}$. Which calculation would find the athlete’s average speed in $\text{m s}^{-1}$?

  • A$\frac{8 + 6}{2}$
  • B$\frac{(8 \times 10) + (6 \times 12)}{22}$
  • C$\frac{(8 \div 10) + (6 \div 12)}{22}$
  • D$\frac{(10 \div 8) + (12 \div 6)}{22}$

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