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9. A block P of mass m is placed on a horizontal frictionless plane.
A second block of same mass m is placed on it and is connected
to a spring of spring constant k, the two blocks are pulled by a
distance A. Block Qoscillates without slipping. What is the
maximum value of frictional force between the two blocks?
(a) kA/2
к
Locker
(b) ka
vooooo Q
P
(c) μ, mg
S
-Hs
(d) Zero

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