Question

question 13 (1 point) ✓ saved
if you walk 450 m north and then 200 m south, what is your displacement?
(a) 250 m (b) 250 m north
(c) 650 m (d) 650 m north
a
b
c
d
question 14 (1 point) ✓ saved
a roller coasters accelerates from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds. whats the acceleration?
a) 24 m/s² b) 18 m/s²
c) 16 m/s² d) 16 m/s

Explanation:

Step1: Define displacement

Displacement is a vector quantity. Let north be positive and south be negative.

Step2: Calculate displacement

First walk \(d_1 = + 450\space m\) (north), then \(d_2=-200\space m\) (south).
Total displacement \(d=d_1 + d_2\)
\(d=450+( - 200)\)
\(d = 250\space m\) (north, since the result is positive)

Answer:

B. 250 m north