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A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He can change the weight of the cart by adding different numbers of balls, and he can change the height of the
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A student wants to know if the weight of a cart affects its speed at the bottom of a ramp. He can change the weight of the cart by adding different numbers of balls, and he can change the height of the ramp by using different numbers of blocks. Which three tests would be invalid? (Select all three)

A student wants to know if the weight of a cart affects its speed at the bottom of-example-1
User Dombesz
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2 Answers

6 votes

Answer: its the first one

Step-by-step explanation:

User Mbseid
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2 votes

Answer: D

Step-by-step explanation:

User Martijn Courteaux
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