A football player with a mass of 75.5 kg and a speed of 2.12m/s collides head-on

Question

A football player with a mass of 75.5 kg and a speed of 2.12m/s collides head-on with a player from the opposing team whosemass is 110 kg. The players stick together and are at rest afterthe collision. Calculate the speed of the second player, assumingthe speedof light is 3.00 m/s I calculated the speed by using the inelastic collision eq.and got -1.46m/s and it was wrong (even when it is positive) so Iam asuming the speed of light has something to do with it but i amnot sure how A football player with a mass of 75.5 kg and a speed of 2.12m/s collides head-on with a player from the opposing team whosemass is 110 kg. The players stick together and are at rest afterthe collision. Calculate the speed of the second player, assumingthe speedof light is 3.00 m/s I calculated the speed by using the inelastic collision eq.and got -1.46m/s and it was wrong (even when it is positive) so Iam asuming the speed of light has something to do with it but i amnot sure how

Explanation / Answer

Given : Mass ( m1 ) = 75.5 kg Velocity ( v1 ) = 2.12 m/s Mass ( m2 ) = 110 kg Velovity ( v2 ) = ? The players stick together and are at rest after thecollision. Calculate the speed of the second player, assuming thespeedof light is 3.00 m/s    c = 3,0 m/s m1v1 / 1-v21/c2 +m2v2 /1-v22/c2 = 0     m2v2 /1-v22/c2 = - [m1v1 / 1-v21/c2 ]    v2 = ----- m/s Plugin the values and solve it I hope it helps you

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