- #1

_Mayday_

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**Question**

Two small balls

**A**and

**B**have masses 0.5kg and 0.2kg respectively. They are moving towards each other in opposited directions on a smooth horizontal table when they collide directly. Immediately before the collision, the spped of

**A**is 3m/s and the speed of

**B**is 2m/s. The speed of

**A**immediately after the collision is 1.5m/s. The direction of the motion of

**A**is unchanged as a result of the collision.

By modelling the balls as particles, find

(

*a*) The speed of

**B**immediately after the collision

(

*b*) The magnitude of the impulse exerted on

**B**after the collision

**Equations**

[tex]Ft=mv-mu[/tex]

**My Attempt**

(

*a*) Conservation of momentum would mean that the initial momentum must be equal to the final momentum.

[tex]Ft=mv-mu[/tex]

[tex](0.5\times3.0)-(0.2\times2.0)=(0.5\times1.5)-(0.2\times x)[/tex]

[tex]1.1=0.75-(0.2\timesx)[/tex]

[tex]x=11.3m/s[/tex]

(

*b*) I have no Idea where to start here, I think it's more a question of now knowing what it is asking for. Is it asking for my value for [tex]Ft[/tex]?

Any help would be great