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Anna007 [38]
2 years ago
10

A rock is dropped off a cliff that is 18 meters high into a lake below. (Assume there is no air resistance.) The formula for the

height of an object dropped is h(t)= 1/2at^2 +s where the gravitational constant, a, is -9.8 meters per second squared, s, is the initial height, and h(t) is the height in meters modeled as a function of time, t. Which of the following are true select all that apply.
The equation for the situation is h(t)= 4.9t^2 + 18.
The equation for the situation is h(t)= -4.9t^2 + 18.
The rock hits the surface of the water after 1.92 seconds.
The rock hits the surface of the water after 2.02 seconds.
Mathematics
1 answer:
rosijanka [135]2 years ago
3 0

Answer:

2nd and 3rd choices

Step-by-step explanation:

use h(t) = h(0) + v(0)t + at^2/2

Now h(0) = 18, v(0) = 0, a = -9.8

so h(t) = 18 - 4.9 t^2

Solve h(t) = 18 - 4.9 t^2 = 0

Get t = 1.92 sec

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Find the sum of all positive integers less than 200 that are divisible by 7.
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a2 = a1 + 7 = 7+7 = 14

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...

an = a1 + (n-1)×7 = 7 + (n-1)×7 = n×7

the sum of an arithmetic sequence is

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