If a rock is thrown upward on the planet Mars with a velocity of $15 \mathrm{~m} / \mathrm{s}$ , its height in meters t seconds later is given by $y=15 t-1.86 t^{2}$ . Find the average velocity over the time interval $[1,4]$ .
A) $2.7$
B) $6 .7$
C) $7.7$
D) $5.7$
E) $4.7$

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The Answer of If a rock is thrown upward on the planet Mars with a velocity of $15 \mathrm{~m} / \mathrm{s}$ , its height in meters t seconds later is given by $y=15 t-1.86 t^{2}$ . Find the average velocity over the time interval $[1,4]$ .
A) $2.7$
B) $6 .7$
C) $7.7$
D) $5.7$
E) $4.7$

If a Rock Is Thrown Upward on the Planet Mars 15 m/s15 \mathrm{~m} / \mathrm{s}15 m/s

If a Rock Is Thrown Upward on the Planet Mars $15 \mathrm{~m} / \mathrm{s}$