A spring (k = 100 Nm –1 ) is suspended in vertical position having one end fixed at top & other end joined with a 2kg block. When the spring is in non-deformed shape, the block is given initial velocity 2 m/s in downward direction. The maximum elongation of the spring is 
meter. Find n:
Text Solution
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(5)
Sol. At the moment, elongation is maximum, speed of the block becomes zero.
Applying W/E theorem on system
0 – 
. mv 2 = W g + W s
. 
2.4 = 2.10. x – 
. 100. x 2 
Solving x = 
Comparing this value with the given value 
meters we conclude that 
.
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