Physics-science

posted by .

A football player weighing 75 kg running at 2 m/s toward west tackles a 70 kg player running 1.5 m/s in the opposite direction. What is the decrease in kinetic energy during the collision?

  • Physics-science -

    First use conservation of momentum to calculate the final velocity of both, V.
    75*2 - 70*1.5 = 145 V
    V = 0.31 m/s (west)

    Now add up the initial and final kinetic energies.

    KE1 = (1/2)*75*2^2 + (1/2)*70*(1.5)^2
    = 150+ 78.75 = 228.75 J
    KE2 = (1/2)*145*(0.31)^2 = 6.97 J

    Subtract for the KE Loss. About 97% of the initial KE is lost.

  • Physics-science -

    A football player weighing 75 kg running at 2 m/s toward west tackles a 70 kg player running at 1.5 m/s in the opposite direction. What is the final velocity of the players if they both fall together

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    001 (part 1 of 2) 10.0 points An 86 kg fullback moving east with a speed of 5.5 m/s is tackled by a 97 kg opponent running west at 3.6 m/s, and the collision is perfectly inelastic. a) What is the velocity of the players immediately …
  2. geometry

    During the half-time show of a football game, a trumpet player and a tuba player start at the same position on the field. The trumpet player then marches 74.8 ft directly toward the goal line, and the tuba player marches directly toward …
  3. physics

    Here's a basketball problem: A 83.0 kg basketball player is running in the positive direction at 7.5 m/s. She is met head-on by a 101.6 kg player traveling at 5.3 m/s toward her. If the 101.6 kg player is knocked backwards at 3.4 m/s, …
  4. physics

    1. A football player weighing 75 kg running at 2 m/s toward west tackles a 70 kg player running at 1.5 m/s in the opposite direction. What is the final velocity of the players if they both fall together?
  5. physics

    An LSU football defender is 6 m behind a Georgia Tech receiver who has the football and is d meters from making a touchdown. If the LSU player is running at 5 m/s and the receiver is running at 4 m/s, what is the furthest distance, …
  6. PHYSICS HELP!

    An 88.5 kg fullback moving east with a speed of 5.5 m/s is tackled by a 94.0 kg opponent running west at 2.90 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate …
  7. Geometry

    During the half-time show of a football game, a trumpet player and a tuba player start at the same position on the field. The trumpet player then marches 76.4 ft directly toward the goal line, and the tuba player marches directly toward …
  8. Physics

    An 89.5 kg fullback moving east with a speed of 5.7 m/s is tackled by a 81.5 kg opponent running west at 2.58 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. m/s (b) Calculate …
  9. Physics 11

    A 90kg basketball player carries about 720J of kinetic energy when running down the court. If the coefficient of kinetic friction between good runners & the floor is .600, how far does the player skid when trying to stop?
  10. Physics

    A football player of mass 103 kg running with a velocity of 2.0 m/s [E] collides head-on with a 110 kg player on the opposing team travelling with a velocity of 3.2 m/s [W]. Immediately after the collision the two players move in the …

More Similar Questions