Question

question 12 (1 point) ✓ saved
the slope of a position - time graph measures which of the following quantities?
(a) average acceleration (b) instantaneous velocity
(c) average velocity (d) distance
a
b
c
d
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

Explanation:

Step1: Define displacement

Displacement is a vector quantity. Let's take north as the positive direction.

Step2: Calculate displacement

The first displacement \(d_1 = 450\space m\) (north) and the second displacement \(d_2=- 200\space m\) (south). The total displacement \(D=d_1 + d_2\).

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Since the result is positive, the direction is north.

Answer:

B. \(250\space m\) north