Answer:
.A. positive, positive.
Explanation:
When we throw a rock upward , it will decelerate due to gravitation . It will have acceleration in downward direction or - ve acceleration in upward direction.
If we define the ground as the origin and upward direction as positive , anything in upward direction will be positive and in downward direction will be negative . For example , in the case described above , acceleration of rock thrown upward is negative because is in downward direction .
Its position is in upward direction , so its position is positive with respect to ground.
It is going in upward direction . So velocity too will be positive.
Answer:
well i'm not sure if which unit of measure you need but i think its 86.49 meters tall.
Black hole
hope it helped
Answer:
![10.0 m/s^2](https://tex.z-dn.net/?f=10.0%20m%2Fs%5E2)
Explanation:
The acceleration of an object is given by
![a=\frac{v-u}{t}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7Bv-u%7D%7Bt%7D)
where
v is the final velocity
u is the initial velocity
t is the time interval it takes for the velocity to change from u to v
For the car in this problem,
u = 21.0 m/s
v = 46.0 m/s
t = 2.5 s
Substituting, we find the acceleration
![a=\frac{46.0-21.0}{2.5}=10.0 m/s^2](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B46.0-21.0%7D%7B2.5%7D%3D10.0%20m%2Fs%5E2)