EK 1001 Physics #408

[BrianK0220]

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Can anyone explain this?

If it's elastic, then we use:

m1v1=(m1+m2)v2

Arbitrary values:

m1=1
v1=3
m2=3
v2=0.75

Wouldn't the answer be (1/4)v1?

Thanks guys.

 

[Charles Darwin]

Can anyone explain this?

If it's elastic, then we use:

m1v1=(m1+m2)v2

Arbitrary values:

m1=1
v1=3
m2=3
v2=0.75

Wouldn't the answer be (1/4)v1?

Thanks guys.

If it's elastic, you have conservation of linear momentum and conservation of kinetic energy. You wrote the equation for a perfectly inelastic collision...

EDIT: And yes, 1/4 of 3 is 3/4.

 

[BrianK0220]

That explains a lot, including why my answer was an answer choice. Thanks.