Answer:
• From first newtons equation of linear motion:
[tex]{ \boxed{v = u + at}}[/tex]
• from that equation, let's get the relation for the change in velocity;
[tex](v - u) = at \\ { \boxed{ \boxed{\delta v = at}}}[/tex]
• a is the acceleration, a = 0.3 m/s and t is time, t = 3s
[tex] \delta v = (0.3 \times 3) \\ { \underline{ \underline{ \delta v = 0.9 \: \: m {s}^{ - 1} }}}[/tex]
Answer: A. 0.9 m/s
