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29 July, 18:45

The distance of through which a stone falls from rest is proportional to the square of the time taken t. if the stone falls 45m in 3 seconds, how far will it fall in 6 seconds? how long will it take to fall 20m?

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  1. 29 July, 19:01
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    D=kt^2

    45=9k, k=5

    D=5 (36) = 180m

    20=5t^2

    4=t^2

    t=2seconds

    Phew. There’s your answer.
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