Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s but collides head-on with a padded goalpost and experiences a backward force of 1.76104N for 5.5010-2s .

Ans: 0.8 m/s (opposite their original direction)

If can? Calculate momentum

Use the momentum impulse theorem

Analyze collisions using conservation of momentum

Calculate torques

Apply Newton's Second Law for rotation