Answer:
6.7 /s.
Step-by-step explanation:
Initial velocity = u m/s
From the question, final velocity, v = - 2u m/s
Note - (the minus sign indicates that the direction was reversed and doubled)
t = 0.45
From equation of motion,
v = u + at
Acceleration, a = (v - u)/t
= (-2u - u)/0.45
= - 3u/0.45
Acceleration, a/Original speed, u = 3/0.45
= 6.7 /s
Answer:
29400
Step-by-step explanation:
![formula: \\ {a}^{2} - {b}^{2} = (a + b)(a - b) \\ ( {197)}^{2} - ( {97)}^{2} \\ = (197 + 97)(197 - 97) \\ = 294 \times 100 \\ = 29400 \\](https://tex.z-dn.net/?f=%20formula%3A%20%20%5C%5C%20%20%7Ba%7D%5E%7B2%7D%20%20-%20%20%7Bb%7D%5E%7B2%7D%20%20%3D%20%28a%20%2B%20b%29%28a%20-%20b%29%20%5C%5C%20%28%20%7B197%29%7D%5E%7B2%7D%20%20-%20%28%20%7B97%29%7D%5E%7B2%7D%20%20%5C%5C%20%20%3D%20%28197%20%2B%2097%29%28197%20-%2097%29%20%5C%5C%20%20%3D%20294%20%5Ctimes%20100%20%5C%5C%20%20%3D%2029400%20%5C%5C%20)
Answer:
A
C
D
B
Step-by-step explanation:
Answer: OPTION D
Step-by-step explanation:
The formula for calculate the surface area of a rectangular prism is:
![SA_{rp}=2(wh+lw+lh)](https://tex.z-dn.net/?f=SA_%7Brp%7D%3D2%28wh%2Blw%2Blh%29)
Where w is the width, h is the height and l is the length.
You can see in the figure attached that:
l=3.4ft
w=3ft
h=4.1ft
Therefore, when you substitute these values into the formula you obtain that the surface area is:
![SA_{rp}=2[(3ft*4.1ft)+(3.4ft*3ft)+(3.4ft*4.1ft)]=72.88ft^{2}](https://tex.z-dn.net/?f=SA_%7Brp%7D%3D2%5B%283ft%2A4.1ft%29%2B%283.4ft%2A3ft%29%2B%283.4ft%2A4.1ft%29%5D%3D72.88ft%5E%7B2%7D)
I’m pretty sure it’s 3 and a 2