Question

A stone is thrown vertically downwards and the formula d=16t²+4t gives the distance,d metres, that it falls in t seconds.How long does it take to fall 420 metres?

Answer 1

Given:

Formula - d = 16t^2 + 4t - d Metres

Time = t Seconds

To find:

Time taken by the Stone to fall 420 Metres Downwards.

Solution: Given in the Attachment.

Conclusion - The time Taken by the Stone to fall 420 Metres is = 5 Seconds.

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