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JEE Mains 2020 Model Paper 1 New Pattern
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© examsnet.com
Question : 28
Total: 75
A small heavy block is attached to the lower end of a light rod of length l which can be rotated about its clamped upper end. What minimum horizontal velocity should the block be given so that it moves in a complete vertical circle?
7
√
g
l
9
√
g
l
2
√
g
l
3
√
g
l
Validate
Solution:
Let the velocity of the body at A is 'v' fro minimum velocity given at A velocity of the body at point B is zero. Applying law of conservation of energy at A and B.
1
2
m
v
2
= mgh
1
2
m
v
2
= mg (2L) ⇒ v =
√
(
4
g
L
)
=
2
√
g
L
© examsnet.com
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