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An unwary football player collides with a padded goalpost while running at a velocity of5.50m/s and comes to a full stop after compressing the padding

An unwary football player collides with a padded goalpost while running at a velocity of5.50m/s and comes to a full stop after compressing the padding and his body0.550m.

(a) How long does the collision last? s (b) What is his deceleration? m/s²

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