Michelle11032 Michelle11032

15-05-2018
Geography

contestada

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?

Respuesta :

Jack11165 Jack11165

16-05-2018

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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