Tarzan (m = 87 kg) tries to cross a river by swinging from a 10.0 m long vine. His speed at the bottom of the swing, just as he clears the water, is...

Tarzan (m = 87 kg) tries to cross a river by swinging from a 10.0 m long vine. His speed at the bottom of the swing, just as he clears the water, is 9.0 m/s. Tarzan doesn't know that the vine has a breaking strength of 1.0 multiplied by 103 N. What is the total force Tarzan excerts on the vine?