Answer:
h=-t2+8t
solve for t where h=7..., we should get two answers to the quadratic
-t2 + 8t = 7
rearranging to get a standard quadratic of ax2+bx+c=0 gives
t2-8t+7=0
factoring we have
(t-7)(t-1)=0
t=7 and t=1
Thus the ball hits 7m at 1 second on the way up and again at 7 seconds on the way back down. The ball is above 7m for 6 seconds.
6 seconds
Step-by-step explanation:
Thus the ball hits 7m at 1 second on the way up and again at 7 seconds on the way back down. The ball is above 7m for 6 seconds
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Answers & Comments
Answer:
h=-t2+8t
solve for t where h=7..., we should get two answers to the quadratic
-t2 + 8t = 7
rearranging to get a standard quadratic of ax2+bx+c=0 gives
t2-8t+7=0
factoring we have
(t-7)(t-1)=0
t=7 and t=1
Thus the ball hits 7m at 1 second on the way up and again at 7 seconds on the way back down. The ball is above 7m for 6 seconds.
Answer:
6 seconds
Step-by-step explanation:
Thus the ball hits 7m at 1 second on the way up and again at 7 seconds on the way back down. The ball is above 7m for 6 seconds