Answer:
(A) 7.9 m/s^{2}
(B) 19 m/s
(C) 91 m
Explanation:
initial velocity (U) = 0 mph = 0 m/s
final velocity (V) = 85 mph = 85 x 0.447 = 38 m/s
initial time (ti) = 0 s
final time (t) = 4.8 s
(A) acceleration = [tex]\frac{V-U}{t}[/tex]
= [tex]\frac{38-0}{4.8}[/tex] = 7.9 m/s^{2}
(B) average velocity = [tex]\frac{V+U}{2}[/tex]
=[tex]\frac{38+0}{2}[/tex] = 19 m/s
(C) distance travelled (S) = ut + [tex]0.5at^{2}[/tex]
= (0 x 4.8) + [tex]0.5 x 7.9 x 4.8^{2}[/tex] = 91 m
