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Mkey [24]
3 years ago
12

PLEASE HELP ASAP !!!!!

Mathematics
2 answers:
WINSTONCH [101]3 years ago
8 0

Answer:

D

Step-by-step explanation:

11 per 1,000

Mademuasel [1]3 years ago
6 0

Answer: d

Step-by-step explanation:

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rock is thrown upward with a velocity of 27 meters per second from the top of a 23 meter high cliff and it misses the cliff on t
ahrayia [7]

the rock will be at 11 meters from the ground level after 5.92 seconds

Step-by-step explanation:

The motion of the rock is a free-fall motion, since the rock is acted upon the force of gravity only. Therefore, it is a uniformly accelerated motion, so its position at time t is given by the equation:

y=h+ut+\frac{1}{2}at^2

where

h = 23 m is the initial height

u = 27 m/s is the initial velocity, upward

a=g=-9.8 m/s^2 is the acceleration of gravity, downward

t is the time

We want to find the time t at which the position of the rock is

y = 11 m

Substituting and re-arranging the equation, we find

11=23+27t-4.9t^2\\4.9t^2-27t-12=0

This is a second-order equation, which has solutions:

t=\frac{27\pm \sqrt{(-27)^2-4(4.9)(-12)}}{2(4.9)}=\frac{27\pm \sqrt{964.2}}{9.8}

So

t_1 = -0.41 s

t_2=5.92 s

The first solution is negative so we neglect it: therefore, the rock will be at 11 meters from the ground level after 5.92 seconds.

Learn more about free fall:

brainly.com/question/1748290

brainly.com/question/11042118

brainly.com/question/2455974

brainly.com/question/2607086

#LearnwithBrainly

8 0
3 years ago
Which of the following tables represents a quadratic function ? Explain how you know .
Aliun [14]
B, the first differences are not the same , that proves it is not linear. The second set of differences are the same this shows it is a quadratic function.

4 0
3 years ago
20 POINTS !!! ONLY HELP IF UR 100% SURE !!!
Arte-miy333 [17]
Your answer is C for sure I am!
8 0
3 years ago
Read 2 more answers
The cost (c) in dollars to rent a chain saw for h hours is found using the equation c = 3h + 6 How much would it cost to rent th
Rudik [331]

Answer:

It cost $42 to rent a chain saw for 12 hours.

Step-by-step explanation:

Plug in 12 for h.

c = 3(12) + 6

c = 36 + 6

c = 42

5 0
3 years ago
Help... do it now if you can pls...
slavikrds [6]

Answer:

1.A,B,C,D

2. AB, CD

3. AC, BD

4. Line AD (don't take my word for this one)

Step-by-step explanation:

7 0
3 years ago
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