Help with magnitude of final velocity please help!?

  • Follow publicly
  • Follow privately
  • Unfollow
A 0.148 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.900 m/s. It has a head-on collision with a 0.291 kg glider that is moving to the more
Best AnswerAsker's Choice
You have two issues here, first, Conservation of Momentum and second, Conservation of Energy.
Also any motion towards the left is arbitrarily negative and motion to the right, positive

Mg1= Mass Glider1
Vg1i= Initial Velocity Glider 1
Vg1f = Final Velocity Glider 1

Mg2= Mass Glider2
Vg2i= Initial Velocity Glider 2 (Note make Vg2i negative)
Vg2f = Final Velocity Glider 2

Conservation of Momentum
Mg1*Vg1i + Mg2*Vg2i= Mg1Vg1f +Mg2*Vg2f

Conservation of Energy
1/2*Mg1*(Vg1i)^2 + 1/2*Mg2*(Vg2i)^2= 1/2*Mg1(Vg1f )^2+1/2*Mg2*(Vg2f)^2

Plug all of number into the two equations above and you can solve for Vg1f and Vg2f.

(Note: Vg1f should be ~ - 3 and Vg2f ~ -2)

Asker's rating & comment

5 out of 5
thanx for your help!
  • 1
  • Comment
Sign In 

to add your answer

No other answers

Who is following this question?

    Member Since:
    Points: Points: Level
    Total Answers:
    Points this week: