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5.Work, Energy, Power and Collision
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$A$ block of mass $m$ moving with a velocity $v_0$ on a smooth horizontal surface strikes and compresses a spring of stiffness $k$ till mass comes to rest as shown in the figure. This phenomenon is observed by two observers:
$A$: standing on the horizontal surface
$B$: standing on the block
To an observer $A$, the work done by spring force is
A
negative but nothing can be said about its magnitude
B
$ - \frac{1}{2}mv_0^2$
C
positive but nothing can be said about its magnitude
D
$ + \frac{1}{2}mv_0^2$
Solution
$ v_{0} \quad \frac{1}{2} m v_{0}^{2}$
$-\frac{1}{2} m v_{0}^{2}$
Standard 11
Physics
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