(a) We can find the acceleration of the plane from the kinematic equation:
vf=vi+at,here, vi=123sm is the initial velocity of the plane, vf=0sm is the final velocity of the plane when it stops, a is the acceleration of the plane and t is the time interval during which the plane is stopping.
Then, from this equation we can find the acceleration of the plane:
a=tvf−vi=3s0sm−123sm=−41s2m.The sign minus indicates that the jet is decelerates.
(b) We can find the displacement of the plane from another kinematic equation:
d=21(vi+vf)t=21⋅123sm⋅3s=184.5m.Answer:
(a) a=−41s2m.
(b) d=184.5m.
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