A particle executes simple harmonic motion with an amplitude of 5 cm. When the particle is at 4 cm from the mean position, the magnitude of its velocity in SI units is equal to that of its acceleration. Then, its periodic time in seconds is: 

(a) 

(b) 

(c) 

(d) 
A particle executes simple harmonic motion with an amplitude of 5 cm. When the particle is at 4 cm from the mean position, the magnitude of its velocity in SI units is equal to that of its acceleration. Then, its periodic time in seconds is: 

(a) 

(b) 

(c) 

(d) 
V= …(1)
A=−^{2}x … (2)
v=a … (3)
=x
A^{2}−x^{2}=x^{2}
5^{2}−4^{2}=(4^{2})
⇒ 3=×4
T=2/