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Why does a catalyst not change the equilibrium position?

It speeds up the forward and reverse reactions equally. You reach equilibrium sooner, but the balance between them stays the same. Want a practice question on this?

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  • Question 4
  • Physics
  • SL
  • Paper 1

A ball is thrown straight up and air resistance is negligible. Which statement is correct?

  • AKinetic energy stays constant all the way up
  • BAcceleration is zero at the highest point
  • CVelocity is zero at the highest point Correct
  • DThe resultant force acts upwards

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  • Physics
  • SL
  • Paper 2

A ball is thrown vertically upward at 12 m/s. Calculate its maximum height. [2 marks]

Student answer: h = 144 ÷ 9.8 = 14.7 m

Mark scheme: 1 of 2

  • M1 Uses v² = u² − 2gh with v = 0 (mark earned)
  • A1 Height = 7.3 m, with a correct unit (mark not earned)

To fix: you missed the 2 in 2g, so divide 144 by 19.6.

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