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20.10.2019 •
Mathematics
Afirecracker shoots up from a hill 140 feet high, with an initial speed of 100 feet per second. using the formula h(t) = −16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
a: five seconds
b: seven seconds
c: nine seconds
d: 11 seconds
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Ответ:
H(t) = −16t^2 + 100t + 140
H(t) = 0 = −16t^2 + 100t + 140
16t^2 - 100t -140 = 0
t = [100 +/- √ (100^2 -4(16)(-140) ) ] /(2(16))
t = 7.43 and t = - 1.18.
El que tiene sentido para la pregunta es t = 7.43 s.
Option B) 7 s (approximately)
Ответ:
763
Step-by-step explanation:
Hope this helps!