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Question

In a planar four bar mechanism the coupler AB has a length of 25cm. At a given instant the end A has velocity of 40cm/sec in the horizontal direction while the point 8 has a velocity of 30cm/sec in the vertical direction. The angular velocity of the coupler AB at the instant is

A
1 rad/sec
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B
2 rad/sec
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C
3 rad/sec
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D
zero
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Solution

The correct option is B 2 rad/sec

VAB=VB VA=30^j40^i

|VAB|=402+302=50

ωAB=|VAB|AB=5025=2 rad/s

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