If the strings are inextensible and pulleys are frictionless, the speed of point G on block M is
A
50m/s
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B
60m/s
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C
70m/s
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D
80m/s
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Solution
The correct option is C70m/s For string ABCD, since the pulley is fixed VA=VB=VC=VD=10m/s (In terms of magnitude) Taking velocity in upward direction to be positive and negative for downward direction. ⇒VD=10m/s↑ Now VD=VH+VE2 VH=−10m/s↓ +10=−10+VE2⇒VE=30m/s↑ Now VE=VF+VG2⇒30=−10+VG2 ⇒60+10=VG ⇒VG=70m/s↑