If 
is force vector, 
is velocity vector, 
vector is acceleration vector and 
vector is displacement vector with respect to mean position than which of the following quantities are always non-negative in a simple harmonic motion along a straight line?
A
. 
B
. 
C
. 
D
. 
Text Solution
Verified by ExpertsThe correct answer is:
A
since all collision are elestic and total energy is conserved Time period of motion of right block is 
.
Time period of motion of left block is 
So. Total time period 
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