ds/dt = 3t^2 - 4t - 6
so when ds/dt = 7
3t^2 - 4t - 6 = 7
3t^2 - 4t - 13 = 0
Solve using the quadratic equation, and use the positive answer.
(I got 2.85 sec)
im trying to take the derivative of this problem and plug in seven but im not getting the answer.
s=t3–2t2–6t t> or equal to 0
where s is measured in meters and t in seconds. When does the particle reach a velocity of 7 m/s?
2 answers
if I am driving a car at 100km / hr and my reaction time is 0.382 seconds.
with many thanks Stephen
with many thanks Stephen