Aspeed-time graph shows a car moving at 10 m/s for 10 s. the cars 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

speed of the car at t = 10 s is given as 10 m/s

now at t = 30 s car comes to rest so v = 0

now in this velocity time graph we can say slope will show the acceleration of the car as we know that acceleration is rate of change in velocity

as we know that

now from above formula

So slope of the graph will represent the acceleration of car which is 0.5 m/s^2

Actually the correct answer is going to be Linear, sloping downward.

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we need to know the time interval during which the force acts. impulse of force = momentum change