3x + 1 ≤ 1
Subtract 1 from each side: 3x ≤ 0
Divide each side by 3 : <em>x ≤ 0</em>
1. the change in position of an object from start to finish, a vector quantity . . . . .<em> displacement</em>
2. a portion of space that contains a value for a measurable quantity at every point in space . . . . .<em> field </em>
3. speed = (distance) / <em>(time to cover the distance)</em>
4. the length of the entire path an object travels from start to finish . . . . . <em>distance</em>
5. a measurement that has both magnitude and direction . . . . . <em>vector</em>
6. a change in displacement with respect to time . . . . .<em> velocity</em>
7. a mental or physical construct or description that describes a physical phenomenon . . . . . <em>model</em>
8. a change in velocity with respect to time . . . . . <em>acceleration</em>
9. a measurement that only expresses magnitude, such as time, temperature, distance, and speed . . . . . <em>scalar</em>
10. objects that are thrown or launched in the air and are subject to gravity . . . . . <em>projectile</em>
Answer:
F = 32 [N]
Explanation:
To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = forces applied [N] (units of Newtons)
m = mass = 40 [kg]
a = acceleration = 0.8 [m/s²]
Now replacing:
![F=m*a\\F = 40*0.8\\F = 32 [N]](https://tex.z-dn.net/?f=F%3Dm%2Aa%5C%5CF%20%3D%2040%2A0.8%5C%5CF%20%3D%2032%20%5BN%5D)
OPTIONS :
A.) the force that the ball exerts on the wall
B.) the frictional force between the wall and the ball
C.) the acceleration of the ball as it approaches the wall
D.) the normal force that the wall exerts on the ball
Answer: D.) the normal force that the wall exerts on the ball
Explanation: The normal force acting on an object can be explained as a force experienced by an object when it comes in contact with a flat surface. The normal force acts perpendicular to the surface of contact.
In the scenario described above, Erica's tennis ball experiences an opposite reaction after hitting the wall.This is in relation to Newton's 3rd law of motion, which states that, For every action, there is an equal and opposite reaction.
The reaction force in this case is the normal force exerted on the ball by the wall perpendicular to the surface of contact.
