Tarzan (m = 78.4 kg) tries to cross a river by swinging from a vine. The vine is 10 m

long. Tarzan doesn't know that the vine has a breaking strength of 1045 N. What
maximum speed (in m/s) can Tarzan have at the bottom of the swing (as he just clears
the water) in order to safely cross the river without breaking the vine?

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