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Escape!

Launch a probe from a planet, an orbit or between two stars. Find the speed that never falls back.

Physics · Class 11 · Escape speed · 8 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. Climb to h = R: Lifting far up: use U = −GMm/r
  2. Just escape: Escape: K at launch must reach U = 0
  3. Heavy and small: Scaling the escape speed: vₑ ∝ √(M/R)
  4. Denser and bigger: Escape speed from density: vₑ ∝ R√ρ
  5. Stop where g is a quarter: Where it stops: use energy, not v² = 2gh
  6. Boost out of orbit: Free a satellite: speed it up to √2 times
  7. Down the tunnel: Inside a planet, V keeps falling to the centre
  8. Between two stars: Many bodies: add the energies, not the speeds