Question

A model rocket is launched and follows the path of a parabola for 10 seconds until it lands.

At which time would the rocket's height be neither increasing or decreasing?

A. At 7 seconds


B. At 9 seconds


C. At 5 seconds


D. At 3 seconds


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A punter kicks a football that follows the path of a parabola. The football reaches its maximum height in 3 seconds.

At which time would the football be decreasing along its path?

A. At 1 second


B. At 4 second


C. At 2 second


D. At 3 second

Answer 1

A parobola is a U shaped line
so if a rocket followed the U shape for 10 seconds it's highest point would be half way
10/2 = 5 so the rocket would not be increasing or decreasing at 5 seconds
Answer is C

for the football max height would be 3 seconds so it would start to decrease after 3 seconds so anything after 3 it would be decreasing.
Answer is B 4 seconds