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vodomira [7]
3 years ago
9

Tennis player strikes a tennis ball from underneath with her racket. The ball is sent straight up with an initial velocity of 19

m/s. How high above the striking point will the ball travel?
Mathematics
1 answer:
alekssr [168]3 years ago
7 0

Answer:

18.42 m

Step-by-step explanation:

At that point, the ball will be static, with final velocity of 0.

The initial velocity is 19.

The acceleration due to gravity is -9.8 m/s^2.

We now have to use an equation of kinematics shown below:

v_f^2=v_0^2+2as

Where

v_f  is the final velocity

v_0 is the initial velocity

a is -9.8

s is the distance we are looking for

Lets substitute and find the answer:

v_f^2=v_0^2+2as\\0=(19)^2+2(-9.8)s\\-361=-19.6s\\s=18.42

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What is an equation of the line that passes through the point (- 7, 0) and is parallel to the line x + y = 1
sweet [91]

Answer:

y = -x - 7

Step-by-step explanation:

If two lines are parallel to each other, they have the same slope.

The first line is x + y = 1.

First, let's put this into standard form.

x + y = 1

y = -x + 1

Now we have an equation in standard form. Its slope is -1. A line parallel to this one will also have a slope of -1.

Plug this value (-1) into your standard point-slope equation of y = mx + b.

y = -x + b

To find b, we want to plug in a value that we know is on this line: in this case, it is (-7, 0). Plug in the x and y values into the x and y of the standard equation.

0 = -1(-7) + b

To find b, multiply the slope and the input of x (-7)

0 = 7 + b

Now, subtract 7 from both sides to isolate b.

-7 = b

Plug this into your standard equation.

y = -x - 7

This equation is parallel to your given equation (y = -x + 1) and contains point (-7, 0)

Hope this helps!

7 0
3 years ago
WILL GIVE BRAINLIEST
Paul [167]
256.
EXPLANATION:

When you are using exponents, you are basically just doing repeated multiplication.

Whatever the exponent (smaller number is) is how many times you multiply the base number by itself.

So 4 ^4 is 4 x 4 x 4 x 4. (4 fours.)

So 4 x 4 x 4 x 4 is 256.
HAVE A GUD DAY
7 0
3 years ago
Are positive and negative numbers the same?<br><br>TRUE or FALSE​
andriy [413]

Answer:

false: positive and negative numbers are on two completely opposite sides of a number line, coordinate plane, etc. Just like 4 is different than 5, it is the same with positive and negative numbers

4 0
2 years ago
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ratelena [41]

Answer:

ummmmm 0.825

Step-by-step explanation:

im pretty sure thats correct i havent done math like that in a while let me know if its right :)

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Step-by-step explanation:

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