With what speed does the object get nearer to the reflection

[annalian]

Homework Statement

An object gets closer to the plain mirror with a speed v. With which speed does it get closer to the reflection?

Homework Equations

l=v*t

The Attempt at a Solution

As l (length of road) is twice as big l2=2l1, but the time is equal t1=t2, then velocity should be two times bigger. Am I right?

 

[CWatters]

As l (length of road) is twice as big l2=2l1, but the time is equal t1=t2, then velocity should be two times bigger. Am I right?

Your answer is correct but I'm not sure I understand your reasoning.

 

[annalian]

Your answer is correct but I'm not sure I understand your reasoning.

Could you give me a hint about the correct one?

 

[haruspex]

Could you give me a hint about the correct one?

You need to explain how you are defining t1 and t2. These are the times taken to do what? (I believe your reasoning is fine if you fill that in appropriately.)

 

[annalian]

You need to explain how you are defining t1 and t2. These are the times taken to do what? (I believe your reasoning is fine if you fill that in appropriately.)

t1 is the time taken to meet the mirror, t2 i the time taken to meet the reflection. As the mirror and reflection are met in the same time t1=t2

 

[haruspex]

t1 is the time taken to meet the mirror, t2 i the time taken to meet the reflection. As the mirror and reflection are met in the same time t1=t2

With that preamble, your answer looks good to me.