Question

A speed-time graph shows a car moving at 10 m/s for 10 s. The car’s speed constantly decreases until it comes to a stop at 30 s.

Which describes the slope of the graph from 10 s to 30 s?


linear, sloping upward

curved, downward

linear, horizontal

linear, sloping downward

Answer 1

The slope of the speed-time graph from 10 seconds to 30 seconds describes the rate of change of speed. Since the car's speed is decreasing constantly until it comes to a stop, the slope during this period will be negative (indicating a decrease in speed).

Since the decrease in speed is constant (meaning that speed decreases at a uniform rate), the slope is also linear.

Therefore, the correct description of the slope from 10 s to 30 s is:

**linear, sloping downward**.