Question

A jet lands on a aircraft carrier at 45 mile (2m/s).
(a)what is its acceleration if it stops in 3 sec.
(b)what is the displacement of the plane which it is stopping.

Answer 1

Given:

$v_i=2\:\rm m/s;$

$v_f=0\:\rm m/s;$

$t=3\:\rm s.$

(a) The acceleration

$$a=\frac{v_f-v_i}{t}=\frac{0-2}{3}=-0.67\:\rm m/s^2.$$

(b) The displacement

$$d=\frac{v_f+v_i}{2}t=\frac{0+2}{2}\times 3=3\:\rm m.$$