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Physics · Grades 6–9

Average speed over two stages

Add all distances and all elapsed times before dividing.

Make a worksheet

Rule and assumptions

Add all distances and all elapsed times before dividing.

v̄ = (d₁ + d₂)/(t₁ + t₂)

Worked examples

A rover travels 124 m in 47 s, then 39 m in 68 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

v̄ = (d₁ + d₂)/(t₁ + t₂) (124 + 39) / (47 + 68) = 1.417

1.417 m/s

A rover travels 300 m in 35 s, then 263 m in 26 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

v̄ = (d₁ + d₂)/(t₁ + t₂) (300 + 263) / (35 + 26) = 9.23

9.23 m/s

Try two questions

  1. A rover travels 249 m in 20 s, then 214 m in 25 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

  2. A rover travels 230 m in 71 s, then 304 m in 62 s. Find its average speed for both stages. Round to 3 decimal places if needed. Answer in m/s.

Answers and reasoning

Answers and marking notes
  1. 10.289 m/s

    v̄ = (d₁ + d₂)/(t₁ + t₂) (249 + 214) / (20 + 25) = 10.289

  2. 4.015 m/s

    v̄ = (d₁ + d₂)/(t₁ + t₂) (230 + 304) / (71 + 62) = 4.015

Further reading and review references

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Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.