1. The problem statement, all variables and given/known data Use the work-energy theorem to solve. A branch falls from the top of a 95 m tall tree, starting from rest. How fast is it moving when it reaches the ground? Neglect air resistance. 2. Relevant equations work-energy theorem:w_total=K_2-K_1 In this problem, K_1 is 0 since it is starting from rest. K_2=(1/2)*m*v^2 (?) w=fd (relevant?) 3. The attempt at a solution If I use the equations I have above, I end up with w=1/2*m*v_f^2. However, I am not given a mass. I do not know how to finish the calculation without a mass. If I use w=fd, I have (9.8 m/s^2)(mass)*(95 m). I am really stuck.