All surfaces are smooth and pulleys are ideal. The string is pulled with force F. mass of A = mass of $B = m$ .

Question

All surfaces are smooth and pulleys are ideal. The string is pulled with force F. mass of A = mass of B = m .

TestHub · Accepted Answer

Block B is on the smooth table with the string tension $T = F$ acting on it horizontally; it accelerates, so $a_{B} \neq = 0$ .

For the body A (the base on which the pulleys are fixed), the string pulls on the two pulleys with forces that cancel horizontally, so there is no net horizontal force on A and $a_{A} = 0$ .

So $a_{A} = 0, a_{B} \neq = 0$ : option (B).

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