Here are the answers to your questions:
9. On a position versus time graph, if an object is not moving, what will the shape of this graph be?
d. Horizontal
A horizontal line indicates that the position is constant over time, which means the object is not moving.
10. From 0 seconds to 15 seconds, what is true about the car?
a. It is not moving
This option indicates that there is no change in position over that time period, which means the car is stationary.
11. If a car is traveling 50 km/hr, how many km will it cover in 2 hours?
Using the formula \(d = vt\),
\(d = 50 \text{ km/hr} \times 2 \text{ hr} = 100 \text{ km}\)
c. 100 km
12. If Mrs. Wade goes a distance of 10 m in 5 seconds, what is her velocity?
Using the formula \(v = d/t\),
\(v = 10 \text{ m} / 5 \text{ s} = 2 \text{ m/s}\)
d. 2 m/s
13. Acceleration is a change in motion over time.
True
Acceleration is defined as the rate of change of velocity with respect to time.
14. Which of the following is an example of negative acceleration?
b. a car slowing down at a stoplight
Negative acceleration (deceleration) occurs when the speed of an object decreases.
15. If a car starts at rest and accelerates to 40 m/s in a time of 10 s, what is the acceleration of the car?
Using the formula for acceleration,
\(a = (V_{\text{final}} - V_{\text{initial}}) / t\)
\(a = (40 \text{ m/s} - 0 \text{ m/s}) / 10 \text{ s} = 4 \text{ m/s}^2\)
a. 4 m/s²