A rod AB is shown in figure. End A of the rod is fixed on the ground. Block is moving with velocity 
m/s towards right. The velocity of end B of rod when rod makes an angle of 60º with the ground is:
A
m/s
B
2 m/s
C
2 
m/s
m/s
D
3 m/s
Text Solution
Verified by ExpertsThe correct answer is:
B
Let AB = 
, B = (x, y)
= vx 
+ vy 
= 
+ 
……(i)
x 2 + y 2 = 𝓁 2
2x v x = 2y v y = 0
+ 
v y = 0
+ (tan60 
) vy = 0
v y = – 1
Hence from (i)
= 
– 
Hence
v B = 2 m/s
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