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It's not possible to find speed knowing only the deceleration.

Deceleration is a rate of speed decrease in time, so 90g could correspond to object slowing from 882m/s to zero in one second or, for example, an object slowing down to zero from 10m/s in 0.012 s.

Deceleration during crash depends heavily on composition and general properties of objects participating.

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16y ago

What else can I help you with?