QUESTION
A particle moves along the $x$-axis so that at time $t \geq 0$ the position of the particle is given by $x(t)=0.5 t^{4}-1.5 t^{3}-2 t^{2}+6 t-1$. What is the velocity of the particle at the first instance the particle is at the origin? (A) -4.071 (B) -2.048 (C) 0 (D) 5.153 (E) 6
Answer is D.
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