How could the block A move to the left corner?

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Homework Statement

See question number 5.

Homework Equations

F=m*a
W=F*s
Uniform acceleration motion equations

The Attempt at a Solution

Actually,I am having some difficult understanding the problem.
See the F.B.D of the system,
see the friction is acting on the block in the forward direction.So how could it move to the left corner of the block?

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haruspex
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could it move to the left corner of the block?
Simple - they both move to the right but B moves faster.

Orodruin
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Block B moves further in the right direction.

haruspex
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Block B moves further in the right direction.
Which it does by moving faster.

Orodruin
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Which it does by moving faster.
Obviously I did not see your reply before I sent mine since there was less than a minute in between.

haruspex