At $t=0,$ an $845-$g mass at rest on the end of a horizontal spring $(k=162\frac{N}{m})$ is struck by a hammer which gives it an initial speed of $2\mathrm{.}34\frac{m}{s}.$

Part C

Determine the amplitude.

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Correct

Part D

Determine the maximum acceleration.

$$

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Correct

Part E

Determine the total energy.

$E_t$

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Correct

Part F

Determine the kinetic energy when $x=0\mathrm{.}40.$A where $A$ is the amplitude.

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What is the answer to part F$?$