Which of these steps could be used in an investigation about the effect of gravity?
A.
measuring the distance a toy car moves after it is pushed
B.
counting how many paper clips stick to a magnet in a chain
C.
testing which surface is easier to slide a wooden block across
D.
measuring the time it takes for a ball to fall a certain distance
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D. measuring the time it takes for a ball to fall a certain distance.......
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