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Posted by on Sunday, February 19, 2012 at 3:58pm.

If superman in space throws a boulder with 10 times as much mass as himself, and the boulder leaves his hands at 100 m/s, how fast does superman recoil?

A) 1000 m/s.
B) The same speed, 100 m/s.
C) 10 m/s.
D) None of these are correct.

  • pop - , Sunday, February 19, 2012 at 5:54pm

    1000 m = m v
    v = 1000

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