Constraint Equations Homework: v0, v1, v2

[Titan97]

Homework Statement

Block C is moving with a velocity v₀ and block A and B are moving with velocities v₁ and v₂ with respect to block C. Find the relation between v₀, v₁ and v₂

Homework Equations

none

The Attempt at a Solution

Since the string is in-extensible, its velocity at both ends should be equal. So v₁=v₂
But should i take the velocity with respect to Earth instead of velocity with respect to block? Both gives me different answers.

 

[haruspex]

So v₀₁=v₂

Did you mean v₁=v₂?
What do you think - should it be the speeds relative to the block that are equal or speeds relative to the ground?

 

[Titan97]

The string itself has a velocity v₀ if A and B are at rest. Then if A acquires a velocity v1, then B should also have a velocity v1.