The variable <span><span>xx</span>x</span><span> is often used to represent the horizontal position. The variable y</span> is often used to represent the vertical <span>The airplane passenger’s initial position is </span><span><span>x_0=6.0\text{ m}<span><span>x<span><span>0</span><span></span></span></span>=6.0<span> m</span></span></span>x, start subscript, 0, end subscript, equals, 6, point, 0, space, m</span><span> and his final position is </span><span><span>x_f=2.0\text{ m}<span><span>x<span><span>f</span><span></span></span></span>=2.0<span> m</span></span></span>x, start subscript, f, end subscript, equals, 2, point, 0, space, m</span>, so his displacement can be found as follows,<span>Δx=<span>xf</span>−<span>x0</span>=2.0 m−6.0 m=−4.0 m</span><span>. His displacement is negative because his motion is toward the rear of the plane, or in the negative x direction in our coordinate system.</span>position.
Acceleration can be thought of as [Change in Velocity]/[Change in time]. To find these changes, you simply subtract the initial quantity from the final quantity.
So for this question you have:
V_i = 110m/s
V_f = 80m/s
t_i = 0s
t_f = 20s
which means that the acceleration = (80-110)/(20-0)[m/s²] = (-30/20)m/s² = -1.5m/s²