Tarzan grabs a vine 12 m long and swings on the end of it, like a pendulum. His starting point is 1.0m above the lowest point in his swing.

Question

Tarzan grabs a vine 12 m long and swings on the end of it, like a pendulum. His starting point is 1.0m above the lowest point in his swing. How fast must Tarzan be moving when he grabs the vine if wishes to reach Jane who is situated across the river and 4m above the lowest point in the swing?

Answer 1

Tarzan grabs a vine 12 m long and swings on the end of it, like a pendulum. His starting point is 1.0m above the lowest point in his swing. How fast must Tarzan be moving when he grabs the vine if wishes to reach Jane who is situated across the river and 4m above the lowest point in the swing?

If he starts at 1.0 m above the ground , he can not make it to 4m above the ground unless an external force is applied

As, the potential energy at 1.0 m is not good enough to take him upto 4m above the ground. Max it can reach is up to 1.0 m above the ground