Although your question is incomplete and the expression is a little incorrect, I have seen it before.
h(t) = -0.2t² + 2t
In order to find the maximum height, we first differentiate the expression and then set the derivative equal to 0. Thus:
0 = -0.4t + 2
t = 5 seconds
The ball reaches its maximum height at 5 seconds
The ball reaches the ground again when h(t) = 0
0 = -0.2t² + 2t
t(-0.2t + 2) = 0
t = 0 ; t = 10
Therefore, the ball reaches the ground when time is 10 seconds
Answer:
3y^5
Step-by-step explanation:
What are the answer choices please?
Answer:
≈ 7 hours
Step-by-step explanation:
Maria can do full job in 13 hours,
she can do 1/13 part of job in one hour
Felipe can do full job in 15 hours,
he can do 1/15 part of job in 1 hour
Together they can do:
- 1/13 + 1/15= 28/13*15= 28/195 of job in 1 hour
to complete full job they need:
- 1 ÷ 28/195= 195/28 ≈ 7 hours