Physics-
General
Easy
Question
A mass of 2.0 kg is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible. When pressed slightly and released the mass executes slightly and released the mass executes a simple harmonic motion. The spring constant is 
. What should be the minimum amplitude of the motion, so that the mass gets detached from the pan? (Take g=10 
)
cm
cm
- Any value less than 12.0 cm
cm
cm
cm
cm
The correct answer is: cm
Let the minimum amplitude of SHM is 
.
Restoring force on spring
Restoring force is balanced by weight 
of block. For mass to execute simple harmonic motion of amplitude .
or 
Here, 
m
Hence, minimum amplitude of the motion should be 10 cm, so that the mass gets detached from the pan.
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