За какое время мяч, свободно падающий с высоты 30 метров, пройдет путь 20 метров? Какова скорость мяча в этот момент времени?

Ask your friend as in the example. Example:blocrs of flats/ neighbourhood.Are there a lot of blocks of flats in your neighbourhood? 

1)a cafe/neighbourhood

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2)a swing/garden 

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3)shops/neighbourhood

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4)garden/near your house

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5)fence/around your house

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6)flowerbeds/in front of the house

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