For this problem, assume that the acceleration of gravity is 10 m/s' downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/'s. What is its velocity after 3 s? 10 m/'s upward 10 m/'s downward ZeTO none of the above choices is correct 9:5- 20m/s If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero. b. there are no forces acting on the object. c. the object is accelerating. d, the object is losing mass. B. A butterfly moves with a speed of v = 12.0 m/s The x-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis must be 30.09 b. 41/89 48 20 53.09 9. A 200-N force is pulling on an object as shown. The sign of the x and y components of the force are a, x (positive), y (positive) X x (positive), y (negative) x (negative), y (positive) x (negative), y (negative)