Do you know how to find the force of a raindrop travelling vertically at 10m/s, hitting a horizontal roof which is 4m squared?
Where Force = Mass x Acceleration... I don't have either in the question, and no way of finding out either... Mass if found with either Force/Acceleration, or Gravity/Weight. Acceleration is found by (final velocity - initial velocity)/time.
Hmm... 3rd law pair for an object falling towards the moon... There's the gravitational pull of the moon, but there's no air on the moon, so I can't have air resistance...
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