Question

a plane flies from Addis Ababa to Gamble is 400km. in 2 hrs, then straight back to Gamma is 200km. in 1hrs what is the average speed, average velocity, total distance and total displacement​

Answer 1

Answer:

a) Average speed = 200 Km/hr

b) Average velocity = 0 m/s

c) Total distance = 800 Km

d) Total displacement = 0 Km

Explanation:

a) Let the speed of the plane from Addis Ababa to Gamble be represented by $S_{1}$, and from Gamble to Addis Ababa by $S_{2}$.

Average speed = $\frac{S_{1} + S_{2} }{2}$

$S_{1}$ = $\frac{distance}{time}$ = $\frac{400}{2}$

        = 200 Km/hr

$S_{2}$ = $\frac{distance}{time}$ = $\frac{200}{1}$

       = 200 Km/hr

Average speed = $\frac{200 + 200}{2}$

        = 200 Km/hr

b) Velocity = $\frac{displacement}{time}$

Average velocity = $\frac{total displacement}{total time taken}$

Since the plane flies from Addis Ababa to Gamble, then back to Addis Ababa, its total displacement is zero.

So that,

Average velocity = 0 m/s

c) Total distance = 400 Km + 400 Km

                           = 800 Km

d) Total displacement = 400 Km + (-400 Km)

                           = 0 Km