Physics - W.E.P. Question with Solution | TestHub

(A) at $\mathrm{x}>{\mathrm{x}}_4, \mathrm{U}=$ constant $=6 \mathrm{J}$

$\mathrm{K}={\mathrm{E}}_{\mathrm{mech}. }-\mathrm{U}=2 \mathrm{J}= \mathrm{constant}$

(B) at $\mathrm{x}<{\mathrm{x}}_1, \mathrm{U}=$ constant $=8 \mathrm{J}$

$\mathrm{K}={\mathrm{E}}_{\mathrm{mech}. }-\mathrm{U}=8-8=0 \mathrm{J}$

Particle is at rest.

(C) At $\mathrm{x}={\mathrm{x}}_2,\mathrm{U}=0\Rightarrow {\mathrm{E}}_{\mathrm{mech}. }=\mathrm{K}=8 \mathrm{J}$
$\mathrm{KE}$ is greatest, and particle is moving at fastest speed.

(D) At $\mathrm{x}={\mathrm{x}}_3, \mathrm{U}=4 \mathrm{J}$

$\mathrm{U}+\mathrm{K}=8 \mathrm{J}$

$\mathrm{K}=4 \mathrm{J}$