Assuming that air friction is not affecting the motion of the ball during the ti
ID: 1405179 • Letter: A
Question
Assuming that air friction is not affecting the motion of the ball during the time that the ball is in the air, which of the following are true? (Select all that apply. Take the positive direction for the horizontal axis to be in the direction of motion.)
The initial horizontal velocity of the ball as it rolls off the track is zero.
The ball speeds up in the horizontal direction as it moves.
The horizontal velocity of the ball in the air is the same as the horizontal velocity of the ball as it rolled along the horizontal portion of the track.
The ball slows down in the horizontal direction as it moves.
The ball is accelerating in the horizontal direction.
The horizontal velocity of the ball just before it touches the ground is the same as the horizontal velocity of the ball just after it rolls off the track.
The ball is moving with constant velocity in the horizontal direction.
Assuming that air friction is not affecting the motion of the ball during the time that the ball is in the air, which of the following are true? (Select all that apply. Take the positive direction for the vertical axis to be upward.)
The acceleration of the ball in the vertical direction is g.
The initial vertical velocity of the ball just after it rolls off the track is zero.
The vertical velocity of the ball just before it lands on the ground is the same as the vertical velocity of the ball just after it rolls off the track
The ball has a constant acceleration downward after it rolls off the ramp.
The ball moves downward with constant velocity.
Explanation / Answer
-) Assuming that air friction is not affecting the motion of the ball during the time that the ball is in the air, the following are true
The horizontal velocity of the ball just before it touches the ground is the same as the horizontal velocity of the ball just after it rolls off the track.
The ball is moving with constant velocity in the horizontal direction.
-) Assuming that air friction is not affecting the motion of the ball during the time that the ball is in the air, the following are true
The acceleration of the ball in the vertical direction is g.
The ball has a constant acceleration downward after it rolls off the ramp.