You can calculate the velocity, momentum, and kinetic energy of the pendflulum when it hits the object but that will not tell you what force it hits the object with. That depends on other things, such as the elasticity of the pendulum head and the object, that are not given.
If the pendulum is raised through angle $\displaystyle \theta$, then it is raised a height $\displaystyle h= L cos(\theta)$ where L is the length of the pendulum. Its potential energy there, relative to the bottom of the pendulum, is $\displaystyle mgh= mgL cos(\theta)$. The kinetic energy is 0. At the bottom the potential energy is 0 so the kinetic energy is [tex](1/2)mv^2= mgL cos(\theta)[tex] so $\displaystyle m= \sqrt{2gL cos(\theta)$.
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Last edited by HallsofIvy; Jul 12th 2017 at 02:33 PM.
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