The gauge is used to indicate the safe load acting at the end of the boom,B, when it is in any angular position. It consists of a fixed dial plate D and an indicator arm ACE which is pinned to the plate at C and to a short link EF. If the boom is pin-connected to the trunk frame at G and is rotating downward at ω_B = 4 rad/s, determine the velocity of the dial pointer A at the instant shown, i.e., when EF and AC are in the vertical position.

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250 mm D -60°E 150 mm 250 mm F 45° WB = 4 rad/s -45° B 300 mm