Ans: A

An object attached to an ideal massless spring is moving across a horizontal frictionless surface. If the spring constant is $100\frac{N}{m}$ and the spring is stretched by $0\mathrm{.}5m$ when the object is accelerating at $2\frac{m}{s^2},$ what is the mass of the object?

A$.50kg$

B$.10kg$

C$.15kg$

D$.25kg$