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Grade: 12
        
Two identical small balls A and B each of mass m connected by a light inextensible string of length l are placed on a frictionless horizontal floor. With what velocity u must the ball B be projected vertically upwards so that the ball A leaves the floor?
one month ago

Answers : (2)

Sanyam Shah
44 Points
							
Apply the equation when system becomes vertical:
T=mg (to lift it from the ground)
T=mu2/l (centripetal force provided by tension to the other ball)
Solve them and get answer u=root(gl)
one month ago
Sanyam Shah
44 Points
							
Above solution is wrong
u = root(gl) is the final velocity of both the balls performing circular motion at that point to find initial speed u
apply energy cnservation law:
1/2mu02 = 1/2mu2 + mgl 
now keep the value of u in above equation and get answer u>=root(3gl)
 
one month ago
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