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 n3?
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