Answer:
[tex]\huge\boxed{\sf a=6.67 \ m/s^2}[/tex]
Explanation:
Final Velocity = Vf = 20 m/s
Initial Velocity = Vi = 10 m/s
Time = t = 3 sec
Acceleration = a = ?
[tex]\displaystyle a = \frac{v_f-v_i}{t}[/tex]
[tex]\displaystyle a = \frac{30-10}{3} \\\\a = \frac{20}{3} \\\\a=6.67 \ m/s^2\ \ \ (3 \ sfs)\\\\\rule[225]{225}{2}[/tex]