Answer:
7 seconds, 6 seconds
Step-by-step explanation:
a) For the object to reach the ground, the height from the ground has to be 0. therefore, let the function h = 0
0 = -16t^2 + 700
the amswers are + or - 6.61
we cant have negative time so it is approximately 7 seconds.
b) for the object to reach a 100 feet, h =100
100 = -16t^2 + 700
0 = -16t^2 + 600
solve: + or - 6.12
therefore it takes approximately 6 seconds to reach 100 feet.
