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D) We know \[[{{M}^{0}}{{L}^{2}}{{T}^{-1}}]\] \[(4{{t}^{3}}-2t),\]\[2\sqrt{20}m/s,60{}^\circ \] \[20\sqrt{3}m/s,60{}^\circ \]\[6\sqrt{40}m/s,30{}^\circ \] \[40\sqrt{6}m/s,30{}^\circ \]We get U = 0 at x = 0 and \[KE=a{{s}^{2}},\] Also we get U = negative for \[2a\frac{{{s}^{2}}}{R}\] From the given function we can see that F = 0 at x = O./.e., slope of U-x graph is zero at x = 0.
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