Question

Neglecting air resistance, which of the following is true for a ball thrown at an angle to the horizontal?a.)It has a constant velocity in the x direction. b.)It has a changing velocity in the +y direction.c.)All of the preceding are true.d.)It has a constant acceleration in the −y direction

Answer 1

Answer: C) All of the preceding are true

Explanation: Velocity changes only when a force acts on an object and makes it accelerate. The only force acting on a ball when it's in motion after its thrown is gravity (if air resistance is neglected). Gravity acts on the y axis, so there is only an acceleration downward in the -y direction, thus only the y-component of its velocity will change. This makes all of the individual statements a b and d true.