Asked by abdi
A rocket is fired upward from ground level with an initial velocity of 480km/hr. after t seconds its distance above the ground level is given by 480t_16t²
for what time interval is the rocket more than 3200km above ground level
for what time interval is the rocket more than 3200km above ground level
Answers
Answered by
oobleck
You have mixed up all your units. 480 km/hr does not translate to 480t unless t is in hours. Also, that -16t^2 looks like English units with g = -32 ft/s^2
But let's just go with your numbers as given, and assume that the height is given in km, after t hours, and g = -32 km/hr^2. Then just solve
480t - 16t^2 > 3200
t^2 - 30t + 200 < 0
(t-10)(t-20) < 0
10 < t < 20
so 10 hours.
But let's just go with your numbers as given, and assume that the height is given in km, after t hours, and g = -32 km/hr^2. Then just solve
480t - 16t^2 > 3200
t^2 - 30t + 200 < 0
(t-10)(t-20) < 0
10 < t < 20
so 10 hours.
Answered by
Abdisa
Thank you very mach
Answered by
Lily
I owe you one bro thanks
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