Acceleration due to gravity.
Answer:
The time it takes the ball to rise equals the time it takes to fall.
Explanation:
because what goes up at some point must come down
Answer:
The y-component of the normal force is 45.74 N.
Explanation:
Given that,
Mass of the crate, m = 5 kg
Angle with hill, ![\theta=21^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D21%5E%7B%5Ccirc%7D)
We need to find the y component of the normal force. We know that the y component of the normal force is given by :
![F_y=F\ \cos\theta\\\\F_y=mg\ \cos\theta\\\\F_y=5\times 9.8\ \cos(21)\\\\F_y=45.74\ N](https://tex.z-dn.net/?f=F_y%3DF%5C%20%5Ccos%5Ctheta%5C%5C%5C%5CF_y%3Dmg%5C%20%5Ccos%5Ctheta%5C%5C%5C%5CF_y%3D5%5Ctimes%209.8%5C%20%5Ccos%2821%29%5C%5C%5C%5CF_y%3D45.74%5C%20N)
So, the y-component of the normal force is 45.74 N. Hence, this is the required solution.
I would go with A. An Observation. Because he's looking at visual differences, for example: "based on smell, color change, and release of bubbles.