An object is moving with simple harmonic motion according to the equation $x = ( 5.0 \mathrm {~cm} ) \cos ( 10 \pi t )$ . The time required for the object to move from its initial displacement to 3.5 cm is
A) 15 ms.
B) 25 ms.
C) 1.5 s.
D) 2.5 s.

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The Answer of An object is moving with simple harmonic motion according to the equation $x = ( 5.0 \mathrm {~cm} ) \cos ( 10 \pi t )$ . The time required for the object to move from its initial displacement to 3.5 cm is
A) 15 ms.
B) 25 ms.
C) 1.5 s.
D) 2.5 s.

An Object Is Moving with Simple Harmonic Motion According to the Equation