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A block is kept on the floor of an eleva...

A block is kept on the floor of an elevator at rest. The elevator starts descending with an acceleration of 12 m/`s^2`. Find the displacement of the block during the first 0.2 s after the start. Take g=10 m/`s^2`.

A

10cm

B

20 cm

C

30 cm

D

40 cm

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