A simple pendulum 4 m long swings with a...

A simple pendulum 4 m long swings with an amplitude of 0.2 m. What is its acceleration at the ends of its path? (g = `10m//s^(2)`)

zero

`10 " m s"^(-2)`

`0.5 " m s"^(-2)`

`2.5 " m s"^(-2)`

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