Problem C5:
A block slides without friction on the surface shown in the figure above.
The block starts off with a speed of
√ n _{1} m/s
to the right.
Then it slides up a height h, where it slows down to a speed of
√ n _{2} m/s.
Finally, it slides down to a level a distance h below where it started. Here,
at the lower level its speed is
√ n _{3} m/s.
What is n_{3}?

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