Ahorizontal line on the time axis of a speed vs. time graph means an object is a) not moving b) moving in a constant speed c) moving at a constant velocity

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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