It is most accurate to say that body mass index (BMI) provides information about an individual's height-weight ratio. The correct answer is B.
V = 1/2at^2
a = 9.8 m/2^2 (constant)
t = 4.0 s
1/2 • 9.8 • 4^2
1/2 • 9.8 • 16
= 78.4 m/s
Answer:
<u>Distance</u><u> </u><u>between</u><u> </u><u>them</u><u> </u><u>is</u><u> </u><u>4</u><u>,</u><u>2</u><u>0</u><u>0</u><u> </u><u>meters</u><u>.</u>
Explanation:
Consinder car A:
![{ \bf{distance = speed \times time }}](https://tex.z-dn.net/?f=%7B%20%5Cbf%7Bdistance%20%3D%20%20speed%20%5Ctimes%20time%20%7D%7D)
substitute:
![distance = 20 \times (2 \times 60) \\ = 2400 \: m](https://tex.z-dn.net/?f=distance%20%3D%2020%20%5Ctimes%20%282%20%5Ctimes%2060%29%20%5C%5C%20%20%3D%202400%20%5C%3A%20m)
Consider car B:
![distance = 15 \times (2 \times 60) \\ = 1800 \: m](https://tex.z-dn.net/?f=distance%20%3D%2015%20%5Ctimes%20%282%20%5Ctimes%2060%29%20%5C%5C%20%20%3D%201800%20%5C%3A%20m)
since these cars move in opposite directions, distance between them is their summation:
![distance \: between = { \sum(distance \: of \: each \: car)} \\ = 2400 + 1800 \\ = 4200 \: m](https://tex.z-dn.net/?f=distance%20%5C%3A%20between%20%3D%20%7B%20%5Csum%28distance%20%5C%3A%20of%20%5C%3A%20each%20%5C%3A%20car%29%7D%20%5C%5C%20%20%3D%202400%20%2B%201800%20%5C%5C%20%20%3D%204200%20%5C%3A%20m)
Answer: e: none of the above.
Explanation:
For any object in the air, the gravitational acceleration will be always -9.8m/s^2, where the negative sign is because gravity pulls the object down.
The instantaneous velocity, as a function of time, for the case of the ball, is
V(t) = (-9.8m/s^2)*t + v0
Where v0 is the velocity at which the ball is thrown up.
The velocity will be zero when the ball is at the top of its flight pat, in that point the sign of the velocity changes, it stops being positive (so the ball stops going up) and becomes negative (so the ball starts to fall down).
Now, while the instantaneous velocity can be zero during the flight, the acceleration does not, it only will be zero when the object hits the ground. Then the only correct option will be e: none of the above.