Question

problem 2: a car travels 8 meters in 2 seconds. it stays motionless for 3 seconds. it then goes - 5 meters in 5 seconds. a. what is the velocity of the car for the first 2 seconds? b. what is the velocity of the car from times 2 - 5 seconds? c. what is the velocity of the car from times 5 - 10s? position - time graph position (m) 0 1 2 3 4 5 6 7 8 9 10 time (s) 0 1 2 3 4 5 6 7 8 9 10

Explanation:

Step1: Velocity for first 2s

$v = \frac{\Delta x}{\Delta t} = \frac{8\ \text{m}}{2\ \text{s}} = 4\ \text{m/s}$

Step2: Velocity from 2-5s (motionless)

$v = \frac{0\ \text{m}}{3\ \text{s}} = 0\ \text{m/s}$

Step3: Velocity from 5-10s

$v = \frac{-5\ \text{m}}{5\ \text{s}} = -1\ \text{m/s}$

Answer:

a. 4 m/s
b. 0 m/s
c. -1 m/s