the height is
y = 15t - 4.9t^2
So, solve for its vertex (max height), and t when y=0 and y=4 to answer the other questions.
It is night and a wilderness camper is in distress. To signal for help, they take a flare gun into a clearing and fire a flare up from the ground at a speed of 15 m/s.
a) How high does the flare make it into the sky?
b) How long is the flare in the sky?
c) If the surrounding trees are 4 metres high, for how long will the flare be visible above the treetops?
1 answer