# Momentum question

1. Nov 18, 2004

### Katerina Villanova

I am desparate and only have 1 submission left on this question. Can someone help me with the answer please?
8. [CJ5 7.P.032.] The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.020 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.040 kg and is initially at rest. After the collision, the two pucks fly apart with the angles shown in the drawing.

Puck a goes into quadrant 1 at an angle of 65.
Puck b goes into quadrant 4 at an angle of 37.

Find the final speed of
(a) puck A and
m/s
(b) puck B.
m/s

2. Nov 18, 2004

### Andrew Mason

Since there is no net momentum in the direction of the y axis:
$$m_{Af} v_{Af}sin\alpha + m_{Bf}v_{Bf}sin\beta$$ = 0

Since initial x momentum is conserved:
$$m_{Af} v_{Af}cos\alpha + m_{Bf}v_{Bf}cos\beta = m_{Ai} v_{Ai}$$

AM