Question

Which of the following is not an example of a projectile?

Question 2 options:

A baseball that has been pitched


A rock being thrown over a bridge


A person sitting in a chair, not moving


A car driving off a cliff

Question 3 (10 points)
A plane is flying east when it drops some supplies to a designated target below. The supplies land after falling for 10 seconds. How high above the ground was the airplane when the supplies were dropped? (Hint: d = 1/2gt2; g = -9.8 m/s2)

Question 3 options:

120 meters


490 meters


980 meters


49 meters

Question 4 (10 points)
As the supplies fell, they traveled 650 meters horizontally. How fast were the supplies and the airplane moving forward? Remember that it took 10 seconds for them to reach the ground. (Hint: v = d/t)

Question 4 options:

65 m/s


6500 m/s


0.154 m/s


660 m/s

Question 5 (10 points)
A projectile has a vertical component and a horizontal component.

Question 5 options:
True
False
Question 6 (10 points)
The shape of a projectile's trajectory is an ellipse.

Question 6 options:
True
False
Question 7 (10 points)
Which of the following is not true about a vertical component?

Question 7 options:

The vertical component of a projectile changes due to gravity.


The vertical component acts the same as an object in free fall.


The vertical component always equals the horizontal component.

Answer 1

Answer to Q 2 :

A person sitting in a chair, not moving is not an example of projectile

Explanation:

A projectile motion is a form of motion experienced by an object that is thrown near the Earth's surface and it moves along a curved path under the action of gravity. Since a person sitting in a chair i not moving so it cannot be considered as a projectile motion.

Answer to Q 3:

The height of airplane was 490 m

Step-by-step explanation:

By using the second equation of motion

S = Vit + 1/2 gt²

Putting the values

S = 0 X t + 1/2 (9.8) (10)² vi = 0

S = 0 + 490

S = 490 meters

Answer to Q 4:

The speed of supplies and airplane was 65 m/s

Step-by-step explanation:

Velocity = distance / time

velocity = 650 / 10

Velocity = 65 m/s

Answer to Q 5:

The statement is True

Step-by-step explanation:

Projectile motion is a motion starting from ground which is x component and above the ground up to a certain height which makes its y component as well. So we can say that it has both x and y component.

Answer to Q 6:

The statement is False

Step-by-step explanation:

The shape of a projectile motion is usually parabolic whereas the ellipse refers to hyperbolic shape so we can say that the shape of projectile is not a parabolic shape.

Answer to Q 7:

The false statement is The vertical component always equals the horizontal component.

Step-by-step explanation:

The vertical motion of a projectile is usually important for the range of the projectile. If we change the degree of angle, the range gets changed. Similarly the vertical component of a projectile is dependent upon the gravity, because when the object is in air there is always a force of gravity acting upon it which brings it back to ground. Vertical and horizontal components of a projectile are never the same.

Answer 2

2). If the person is just sitting there and not moving, then he certainly can't be a projectile.

3). The formula to use is right there under the question. D = 1/2 g t² . 'g' is 9.8 m/s². Write " 9.8 m/s² " in place of 'g' in the formula. 't' is 10 seconds. Write " 10 seconds " in place of 't' in the formula. then the formula will tell you what 'D' is, and that's the answer to Question 3. I got 490 meters in my head, but you need to check this.

4). The formula to use is right there under the question. v = d / t . 'd' is 650 meters. Write " 650 meters " in place of 'd' in the formula. 't' is 10 seconds. Write " 10 seconds " in place of 't' in the formula. Then the formula will tell you what 'v' is, and that's the answer to Question 4. I got 65 m/s in my head, but you need to check this.

5). Technically, this statement is false. The projectile does not have a vertical or horizontal component. But the projectile's displacement, velocity, and acceleration all do. (At least they do while it's flying.)

6). The shape of a projectile's trajectory is a parabola.

7). The vertical component of a projectile depends on who designed it. The vertical components of the projectile's displacement, velocity, and acceleration are the same as the vertical components of the displacement, velocity, and acceleration of any other object in free-fall. (If you ignore air resistance.)