Grade 12Mechanics
in the image, the velocity of the lift is 2 m/s upwards while the string is winding on the motor shaft at 2m/s and block a is moving with a velocity of 2m/s downwards.then find out velcoity of vlock B.
3 Answers
G Narayana Raju
by use constraints we can solve the sum,
as vb=va+(velocity of winding)
but given that the whole system is moving upward at 2m/s.
there for vb=4+1
=5m/s.
Harsh jain
(V-4)/2= 2 Velocity =8m/s upward by the use of pully Travels average of the two points constrained motion equation
Shwetanki
Va = Val + Vl = 2-2 = 0
Use point method
-V+2+2+0 =-2 (as length of string decreasing by 2m/s rate)
V= 6m/s
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