Consider the collision of two identical hockey pucks on a smooth ice rink. Assum

Question

Consider the collision of two identical hockey pucks on a smooth ice rink. Assume that byanalyzing the videotape of the collision, various but not all components of the velocities of the two pucks before and after the collision have been determined and are recorded in the table below. .
BEFORE vx(cm/s) BEFORE vy(cm/s) AFTER vx(cm/s) AFTER vy(cm/s) Puck 1 21 35 Consider the collision of two identical hockey pucks on a smooth ice rink. Assume that byanalyzing the videotape of the collision, various but not all components of the velocities of the two pucks before and after the collision have been determined and are recorded in the table below. .
BEFORE vx(cm/s) BEFORE vy(cm/s) AFTER vx(cm/s) AFTER vy(cm/s) Puck 1 21 35 BEFORE vx(cm/s) BEFORE vy(cm/s) AFTER vx(cm/s) AFTER vy(cm/s) Puck 1 21 35 BEFORE vx(cm/s) BEFORE vy(cm/s) AFTER vx(cm/s) AFTER vy(cm/s) Puck 1 21 35 BEFORE vx(cm/s) BEFORE vy(cm/s) AFTER vx(cm/s) AFTER vy(cm/s) Puck 1 21 35

Explanation / Answer

using conservation of momentum for pucks in x direction,

let both of them have mass

1kg 21*(1)-46*(1)=-13*(1)+vx2*(1) vx2=12 -velocity of puck two in x direction similarly,

35(1)+15*(1)=10*(1)+vy2*(1) vy2=40 -velocity of puck in y direction

kinetic energy difference between initial and final values

21*21/2 +35*35/2 + 46*46/2 + 15*15/2 - (13*13/2 + 100/2 + 144/2 + 1600/2)=997 J

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