How Far Will the Pendulum Swing After a 250m/s Rifle Bullet Buried Itself?

[mrtkawa]

i need a help on this problem

a 20g rifle bullet traveling 250m/s buries itself in a 3.8kg pendulum hanging on a 2.3m-long string. how far does th ependulum swing horizontally?

Physics 3rd edition Douglas C. Giancoli

 

[mrtkawa]

also this formuls might be handy

V1=(m+M)/mv'=(m+M)/√２ｇｈ

ｇ＝gravity

 

[phucnv87]

The conservation of momentum

$$(M+m)v=mv_0$$

The conservation of energy

$$\frac{1}{2}(M+m)v^2=(M+m)gl(1-\cos\theta)$$

The horizontal displacement

$$\Delta x=l\sin\theta$$

Solving the equation will give you the answer[/color]

 

[mrtkawa]

thanks i got it