Suppose that instead of speeding up as you walked, you slowed down. what effect do you think it would have on the amount of time it would take you to walk the 10 meters?

To walk 10 meters you would have to take the acceleration of 9.8 since that is the scale factor, and times it by the meters, which is ten.

I think the correct answer from the choices listed above is the second option.  According to the law of conservation of energy, in a closed system, energy will be exchanged, but matter will not be exchanged. Exchange of energy can happen on the sides of the system by heat transfer if it is not insulated. Also, in a closed system matter cannot be exchanged since matter cannot enter or leave the system.

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