Answer:
Plane's initial speed: 14[tex]\frac{m}{s}[/tex]
Plane's acceleration: -1 [tex]\frac{m}{s^{2} }[/tex]
Explanation:
average velocity =[tex]\frac{V_{0} +V_f }{2}[/tex]
V0=?
Vf= 0 m/s (rest)
t=7 s
Isolating V0
V0=2a-Vf = 2*(7) - 0= 14[tex]\frac{m}{s}[/tex]
Otherwise;
[tex]a= \frac{V_f-V_0}{t} = \frac{0\frac{m}{s}-7\frac{m}{s} }{7s} = -1 \frac{m}{s^2}[/tex]
