Question

The three initial and final positions of a man on the x-axis are give as

(1) (-3 m, 7 m) (2) (7m, -3 m) (3) (-7m, 3m)

Which pair gives the negative displacement?

• A. (1)
• B. (2)
• C. (3)
• D. (1) and (3)

Answer 1

Answer: (B)

(2)

Answer 2

Displacement = final positions – Initial positions

$\Delta x = x_{2} - x_{1}$

Then ,

(i) $\Delta x = 7m - ( - 3m) = 10m$

(ii) $\Delta x = - 3m - 7m = - 10m$

(iii) $\Delta x = 3m - ( - 7m) = 10m$