1.

In the figure shown block B moves down with a velocity 10m/s The velocity of A in the position shown is

Answer»

Velocity of B is = 10 ,

so, velocity of string connecting to A , u is given by

10 = (u+0)/2

=>u = 20 m/s

now this Velocity will always be constant along the string
so, velocity of A along the string is
u'cos(37) = 20
=> u = 20/(cos37) = 20*5/4 = 25m/s



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