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Speed is a function of distance and time, so you need to be able to measure both.  What do you have handy to do this with?

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This will vary depending on the size of your rolling object!

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This will vary depending on the size of your rolling object!

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*if you use different mass balls, you already have this covered!

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hairdryer, bendy ruler, finger flick, what else could you put together?

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Consider what you used for the Beaker demo!

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Consider what you used for the Beaker demo!

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Rolling chair? Skateboard? What else?

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Toy cars

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The Clock app on most devices can track speed (time), use the stopwatch section

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books?

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I can mesure the size of the desk and see how long it took by the duration of the video

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I can mesure the size of the desk and see how long it took by the duration of the video

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A kick with your foot