Darla and Rob plan an investigation to see if adding weights to a car affects its speed down a ramp. Their experimental setup consists of a ramp made of a piece of wood that is 30 cm long. The ramp is propped up on four books to give it a height at one end of 8 cm. What is the independent variable in this investigation?
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Darla and Rob plan an investigation to see if adding weights to a car affects its speed down a ramp....
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