A 10 kg small block is pulled in the vertical plane along a frictionless surface in the form of an arc of a circle of radius 10 m. The applied force is of 200 N as shown in the figure. If the block started from rest at A, the speed at B would be: (g = 10 m/s 2 )
A
m/s
B
m/s
C
m/s
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
B
System is block & string. Applying work energy theorem on system
(200)10 – 10g (R – R cos60º) = 
(10)v 2 
2(200 – 10 × 5) = v 2
v = 
= 
m/s
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