| 131. A stone is thrown vertically down-wards and the formula d = 16t

1.	\| 131. A stone is thrown vertically down-wards and the formula d = 16t ^2+4t gives the distance, d metres,that it falls in t seconds. How longdoes it take to fall 420 metres ?
Answer» Answer: 5 SECONDS Step-by-step explanation: 420 = 16t^2+4t 16t^2+4t-420=0 4(4t^2+t-105)=0 4t^2+t-105=0 (4t+21)(t-5)=0 t = 5 & t = -5.25 Time cannot be NEGATIVE, THEREFOR t = 5 seconds

| 131. A stone is thrown vertically down-wards and the formula d = 16t ^2+4t gives the distance, d metres,that it falls in t seconds. How longdoes it take to fall 420 metres ?

Answer»

Answer:

5 SECONDS

Step-by-step explanation:

420 = 16t^2+4t

16t^2+4t-420=0

4(4t^2+t-105)=0

4t^2+t-105=0

(4t+21)(t-5)=0

t = 5 & t = -5.25

Time cannot be NEGATIVE, THEREFOR t = 5 seconds

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| 131. A stone is thrown vertically down-wards and the formula d = 16t ^2+4t gives the distance, d metres,that it falls in t seconds. How longdoes it take to fall 420 metres ?​

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| 131. A stone is thrown vertically down-wards and the formula d = 16t ^2+4t gives the distance, d metres,that it falls in t seconds. How longdoes it take to fall 420 metres ?