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Physics · Grades 8–11

Closing speed

Add speeds only here because the objects move directly toward each other.

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Rule and assumptions

Add speeds only here because the objects move directly toward each other.

closing speed = v₁ + v₂

Worked examples

Two carts approach each other on a straight track at 27 m/s and 25 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

closing speed = v₁ + v₂ 27 + 25 = 52

52 m/s

Two carts approach each other on a straight track at 21 m/s and 19 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

closing speed = v₁ + v₂ 21 + 19 = 40

40 m/s

Try two questions

  1. Two carts approach each other on a straight track at 8 m/s and 19 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

  2. Two carts approach each other on a straight track at 25 m/s and 21 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.

Answers and reasoning

Answers and marking notes
  1. 27 m/s

    closing speed = v₁ + v₂ 8 + 19 = 27

  2. 46 m/s

    closing speed = v₁ + v₂ 25 + 21 = 46

Further reading and review references

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