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Q. An arrow is fire with a speed of 20m/s at the block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. All through the procedure the arrow's deceleration has a magnitude of 1550 m/s2 and the block's acceleration has a magnitude of 450 m/s2. How long does it take for arrow to stop moving with respect to the block?

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