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A small block of mass \( 50 \mathrm{~g} \), compressing a spring (of spring constant \( k=500 \mathrm{Nm}^{-1} \) ) by \( 10 \mathrm{~cm} \) is released on a horizontal surface. The surface to the right of \( \mathrm{A} \) is rough \( (\mu=0.2) \). Find the following:
The velocity (v) of the block as a function of time \( (t) \), when it moves on to the rough surface.
(1) \( v=0.5+2 t \)
(2) \( v=0.5-2 t \)
(3) \( v=10-2 t \)
(4) None of these
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