Aspeed-time graph shows that a car moves at 10 m/s for 10 s. the car’s speed then steadily decreases until it comes to a stop at 30 s. which of the following describes the slope of the speed-time graph from 10 s to 30 s?
a. linear, horizontal
b. curved, upward
c. linear, sloping downward
d. linear, sloping upward
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