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Paul’s class investigated the effects of friction on the motion of a toy car. Using ramps with different surfaces, students determined the amount of time, in seconds (s), for the toy cars to reach the bottom of each ramp. All variables were controlled except the tested variable (independent variable). Paul's group concluded that toy cars on a sandpaper surface are fastest.

User Tal Haham
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3 votes

Answer:

C

Step-by-step explanation:

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User Yggdrasil
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Answer:The conclusion is valid for the data recorded

Step-by-step explanation:

User Trax
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