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+{\obeylines%
+WY5V8181
+HR
+}
+\noindent(a)
+
+Speed is absolute velocity (i.e. regardless of direction). Both A and B
+have increasing absolute distance from the x-axis at every time shown on
+the graph, so neither has decreasing speed.
+
+\noindent(b)
+
+At $t=0$, $t=2$, A and B are moving at the same speed because their
+lines on the graph intersect.
+
+\noindent(c)
+
+Object A.
+
+\noindent(d)
+
+$$W = \Delta E.$$
+The initial velocities of both objects are zero, so their initial
+energies are zero, and $$W = E_f = {1\over2}mv^2.$$ Because
+$m_A = m_B,$ and $$|v_A| > |v_B| \to v_A^2 > v_B^2\hbox{ at $t=4$},$$
+object A has more energy and has thus had more net work done to it.
+
+\bye