Question 1 (10 points) the path a projectile takes is known as the question 1 options: vertical component trajectory horizontal component parabola question 2 (10 points) 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. question 8 (10 points) during the course of trajectory, the horizontal component of the velocity is question 8 options: constant increasing decreasing negative question 9 (10 points) in the simulation above, as the projectile travels upward, how does the vertical velocity change? question 9 options: vertical velocity remains the same. vertical velocity decreases. vertical velocity is zero. vertical velocity increases. question 10 (10 points) in the simulation above, as the projectile travels downward, how does the vertical velocity change? question 10 options: vertical velocity decreases. vertical velocity is zero. vertical velocity remains the same. vertical velocity increases.\

1. Parabola

The path taken by a projectil is known as parabola, and it consists of two independent motions:

- along the horizontal direction, it is a uniform motion with constant speed

- along the vertical direction, it is an accelerated motion with constant acceleration, g=9.8 m/s^2 downward

2. A person sitting in a chair, not moving

This is NOT a motion of a projectile. In fact, the person is not moving at all, so this is not a motion.

3. 490 meters

The supplies will move of uniform accelerated motion, with constant acceleration g=9.8 m/s^2, so the distance they cover is given by

4. 65 m/s

The horizontal motion of the supplies is a uniform motion, with constant speed equal to the ratio between the horizontal distance covered and the time taken:

5. True

As explaned in exercise 1), a projectile has two independent motions: one along the horizontal direction and one along the vertical direction. Therefore, it also has a horizontal component of the velocity (which is constant) and a vertical component of the velocity (which changes because there is an acceleration acting along this direction)

6. False

As stated in exercise 1) and 2) the trajectory of a projectile is a parabola, not an ellipse.

7. The vertical component always equals the horizontal component

This statement is not true: as we said, the horizontal component of the velocity is constant, while the vertical component constantly changes, so they cannot be always equal (in fact, they will be equal only at some precise instant of the motion)

8. constant

As stated before, there is no force acting along the horizontal direction of the projectile's motion, so the horizontal acceleration is zero, and this means that the horizontal velocity is constant.

9. Vertical velocity decreases.

When the projectile is moving upward, its vertical velocity decreases, because the acceleration (which acts downward) acts in the opposite direction of the velocity. More specifically, the vertical velocity is given by

where v0y is the initial vertical velocity of the projectile, t is the time and g=9.8 m/s^2.

10.  Vertical velocity increases.

When the projectile is moving downward, its vertical velocity increases, because the acceleration (which acts downward) this time is acting in the same direction of the velocity

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