Two blocks A and B, have equal masses. They are placed next to each other on a horizontal frictionless fixed table. Each block is then pulled across the table by horizontal forces of different magnitu

Question

Two blocks A and B, have equal masses. They are placed next to each other on a horizontal frictionless fixed table. Each block is then pulled across the table by horizontal forces of different magnitudes as shown. Compare the velocities of the blocks as each of them reaches the opposite end of the table. The velocity of block A is:

TestHub · Accepted Answer

Work-energy theorem: W = Δ K E . Both blocks move the same distance d from rest. Block A: 4 F d = 2 1 ​ m v A 2 ​ . Block B: F d = 2 1 ​ m v B 2 ​ . v B 2 ​ v A 2 ​ ​ = 4 ⇒ v A ​ = 2 v B ​ .

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