The graph above shows the velocity of a car over 30 seconds.Name: Date:

1) What was the velocity at time t=20 seconds (to the nearest whole number)?

2) How many seconds did it take to reach a velocity of 48m/s (to the nearest whole number)?

3) Work out the average gradient between t=0 and t=30 seconds (correct to 1 d.p.)

4) Estimate the gradient at 16 seconds (correct to 1 d.p.)

5) Interpret your result:

- What does this gradient represent?

- Compare the gradient at 16 seconds with the average gradient

- What is happening over time?

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2) 12 seconds

3) average gradient = 1.7

4) gradient at t=16 is 1

5) The gradient represents the acceleration of the car. The gradient at 16s is less than the average gradient over 30 seconds. Over time the car is accelerating at a decreasing rate.

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# Answers

1) 56m/s2) 12 seconds

3) average gradient = 1.7

4) gradient at t=16 is 1

5) The gradient represents the acceleration of the car. The gradient at 16s is less than the average gradient over 30 seconds. Over time the car is accelerating at a decreasing rate.

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