Parabola Word Problems

1.) A stone is thrown straight up from ground level with a velocity of 96 ft/sec, its height in feet t seconds later will be s(t) = 76t-16t 2 a.) How far above the ground is the stone at t = 2 sec? b.) Find the highest point the stone reaches? c.) Find when the stone is rising?

at 4 sec?

at 7 sec?

When does it reach its highest point?_ Find when the stone is falling?

d.) Find when the stone hits the ground?

2.) An arrow is shot straight up from a window 96 feet above the ground with an initial velocity of 80 ft/second. It's height above the ground is given by the formula = -16t2

a.) What is the height of the arrow above the ground at t = 1 sec? _ b.) Find the highest point the arrow reaches? c.) Find when the arrow is rising? d.) Find when the arrow will hit the ground

t = 3 sec?

When does it reach its highest point?_ Find when the arrow is falling?