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An unwary football player collides with a padded goalpost while running at a velocity of 7.60 m/s and comes to a full stop after compressing

An unwary football player collides with a padded goalpost while running at a velocity of 7.60 m/s and comes to a full stop after compressing the padding and his body 0.400 m.(a)What is his deceleration in m/s2? (Enter the magnitude.) m/s2(b)How long in seconds does the collision last? s

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