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Q.

A block of 60 kg is released from rest when compresson in the spring is 2m (normal length of spring is 8 m). Surface AB is smooth while surface BC is rough. Block travels x distance on rough surface before coming to complete rest. The value of x is : (g = 10 m/s2) 

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a

zero

b

3 m

c

1 m

d

2 m

answer is A.

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Detailed Solution

12×200×22  = 0.5×60×10x+12200x2

 x = 1 m

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