Question

A roller coaster starts down a hill at 10 m/s. Three seconds later, its speed is 32 m/s. What is the roller coaster’s acceleration?
Question 1 options:

-7.3 m/s


-7.3 m/s2


3 m/s

3 m/s 2
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Question 2 (2 points) Question 2 Unsaved
Natalie accelerates her skateboard along a straight path from 4 m/s to 0 m/s in 25.0 s. Find the acceleration.

Question 2 options:

-6.25 m/s2


0.16 m/s2


-0.16 m/s2


6.25 m/s2

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Question 3 (2 points) Question 3 Unsaved

Find the average acceleration of a northbound subway train that slows from 12 m/s to 9.6 m/s in 0.9 s

Question 3 options:

-2.7 m/s2


2.7 m/s2


-2.7 m/s


2.7 m/s

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Question 4 (2 points) Question 4 Unsaved
What is a chicken’s rate of acceleration that speeds up from 4 mph (mi/h) to a top speed of 9 mi/h in 0.5 hr?

Question 4 options:

2.5 mi/h/s


-2.5 mi/h/s


2.5 mi/h2


10 mi/h2

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Question 5 (2 points) Question 5 Unsaved
Which units would be appropriate to measure Acceleration?

Question 5 options:

m/s with direction


m/s2


Kg (m/s)


m/s

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Answer 1

1) a = Δv/Δt
a = (32-10)/3
a = 7.33 m/s²

2) a = (0 - 4)/25
a = -0.16 m/s²

3) a = (9.6 - 12) / 0.9
a = -2.7 m/s²

4) a = (9-4)/0.5
a = 10 mi/h²

5) m/s²