Question 9

A projectile of mass M needs an initial velocity of 2*10⁴ m/s to escape from Planet X such that very far away its kinetic energy is negligible. If a rocket of mass 2M is initially at rest far from Planet X and falls because of gravity, how fast will it hit the surface of Planet X?

• A.    1*10⁴ m/s
• B.    2*10⁴ m/s
• C.    4*10⁴ m/s
• D.    8*10⁴ m/s
• E.    Insufficient information

Formula Sheet

Question 8

Question 10

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