question_answer

A particle of mass 0.3 kg is subjected to a force \[F=-\text{ }kx\]with\[k=15\text{ }N/m.\]What will be its initial acceleration, if it is released from a point 20 cm away from the origin?      [AIEEE 2005]

A) \[3\text{ }m/{{s}^{2}}\]

B) \[15\text{ }m/{{s}^{2}}\]

C) \[5\text{ }m/{{s}^{2}}\]

D) \[\text{10 }m/{{s}^{2}}\]

Correct Answer: D

Solution :

[d] Given,

and

As                                    ...(i)

and                                  ...(ii)

[from Eqs. (i) and (ii)]

or

Initial acceleration