Assumptions

Q. In absence of air, projectile motion is always a 2D motion.

1. True
2. False

Q. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

1. Velocity is constant
2. Acceleration is constant
3. Kinetic energy is constant
4. It moves in a circular path

Q. In absence of air, projectile motion is always a 2D motion.

1. True
2. False

Q. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

1. Velocity is constant
2. Acceleration is constant
3. Kinetic energy is constant
4. It moves in a circular path