Tarzan (85kg) is swinging on a vine that is 11 meters long into the waiting arms

Question

Tarzan (85kg) is swinging on a vine that is 11 meters long into the waiting arms of jane below. The net force on tarzan as he swings is 510 N. Unfortunately for him, he misjudges his swing and instead slams into a tree when the vine is completely vertical. His impact with the tree lasts 0.8 seconds, and jane is not impressed. You can assume he puts a constant force on the tree as he crashes. To make matters worse, after slamming to a stop, he slides down the tree with a constant acceleration of magnitude 5 m/s2. What is the magnitude of the force that the tree puts on tarzan?

Explanation / Answer

I don't see how this can be solved. "The net force on Tarzan as he swings is 510 N." What does that mean? How long, or where, is that force in effect? The force certainly isn't constant over any extended range of his swing. Without knowing this, there is no way to find the velocity at impact.
IF we have the velocity at impact, then
F = mv / t = 85kg * v / 0.8s

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