The wall exerts a force of equal magnitude but in the opposite direction. So the force by the wall is 10 N to the right.
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This is an example of the Newton`s Second Law:
F = m * a
a = F / m
F = 8 N, m = 2 kg.
a = 8 N : 2 kg
Answer:
a = 4 m/s²
The total energy (also called mechanical energy) is the sum of the kinetic energy and potential energy:

For this pendulum, we see that at t=0.60 s the total energy is TE=0.918 J while the potential energy is 0.054 J, so the kinetic energy (the missing value in the table) is
Answer: 13.2678 kg
Explanation: Well, 13.2678 kg is 29.25 in mass and kg.