Question

PLEASE HELP!! PHYSICS QUIZ!

Answer 1

1.

Answer: True

Explanation: A projectile is launched at certain angle with the horizontal. Hence, its equation of motion can be described using vertical and horizontal components. Therefore, the statement is true.

2.

Answer: False

Explanation:

The shape of the trajectory of a projectile is parabola. Hence, the given statement is false.

3.

Answer: A) constant

Explanation: During the course of trajectory, the horizontal component of the velocity is constant. There is no external force acting in the horizontal direction. In the vertical direction,  acceleration due to gravity acts which increases the vertical component of velocity. Hence, the correct option is A.

Answer 2

1).  Technically false if you're persnickety about your words.  But this quiz wants you to say 'True'.

The projectile doesn't have vertical and horizontal components.  But if the projectile is moving, then its displacement, velocity, and acceleration can have vertical and horizontal components.

2).  This one's false.  The shape of a projectile's trajectory is a parabola. (Unless the projectile is moving fast enough to be in a stable orbit.  THEN its path is an ellipse.)

3). During the time the projectile is flying, the horizontal component of its velocity is constant IF THERE'S NO AIR RESISTANCE.

If there IS air resistance, then the horizontal component of velocity is decreasing.