Answer: it depends on the mass of the pendulum or on the size of the arc through which it swings.
Explanation:
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To determine the force of the system, we use Newton's Second Law of motion which relates force and mass where they are directly proportional and the constant of proportionality is the acceleration. We calculate as follows:
F = ma
F = 10.41 kg ( 6.5 m/s^2 )
F = 67.67 kg m / s^2 or N
Answer is C I believe I may be wrong but.