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## Acceleration

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
If Tina starts out at 10 m/s, and in 10 s speeds up to 20 m/s, what is her acceleration?
1. $100m/(s^2)$
2. $2m/(s^2)$
3. $1m/(s^2)$
4. $3m/(s^2)$
2.
A bike accelerates from 100 km/hr to 200 km/hr in 4s. What is the acceleration?
1. $20m/(s^2)$
2. $25m/(s^2)$
3. $0m/(s^2)$
4. $100m/(s^2)$
3.
If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?
1. $1.25m/s^2$
2. $5m/s^2$
3. $6.25m/s^2$
4. $40m/s^2$
4.
If the acceleration of an object is negative, its velocity
1. will be increasing.
2. will be decreasing.
3. will be zero.
4. will be constant.
5.
What is the definition of acceleration?
1. An object's resistance to motion
2. How fast
3. How much stuff (matter) is in an object
4. The change in velocity over time
6.
A car changes its speed from 0 to 25 m/s in 3.6 seconds. What is its acceleration?

7.
A man is driving his car north on the highway at a constant velocity of 50 mph for 100 s. What is the value of his acceleration?

8.
A quarter is flipped up in the air at the start of a football game and returns to the point from which it was flipped after $2.5s$. Find the quarterâ€™s original speed. The acceleration of the quarter is $9.8m/(s^2)$ downward.
1. 4.9 m/s
2. 25 m/s
3. 12.25 m/s
4. 49 m/s
9.
A watermelon is dropped from the roof of a three-story building. Assuming the friction of air is negligible, how far does the watermelon have to fall in order to reach a velocity of 10 m/s?
1. 4.9 m
2. 5.1 m
3. 9.8 m
4. impossible to determine
10.
You drop a penny and a silver dollar out of a high window. Which will hit the ground first if there is no air resistance?

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