An object moves with constant velocity or uniform velocity, that means object moves with... . Choose all that apply   A. speed is constant but direction is changing.   B. constant speed in a straight line.   C. changing speed in a straight line.   D. same speed or constant speed.Direction has nothing to do with it.

3. An object is dropped from a height. a. Describe its velocity as its falls to the ground. b. Describe its acceleration as it falls to the ground.

25. An object has increasing velocity when its acceleration is greater than zero. It has increasing speed when its velocity and acceleration have the same sign. For what times is: a. the velocity of the ball increasing? b. The speed of the ball increasing?

10. A car drives to the north at constant speed. Which direction does its acceleration point? Explain.

16. Sketch the velocity-time graph of the different parts of his motion from the airplane to the ground. [Appendix A] A. Jumps from airplane. B. Reaches terminal velocity. C. Pulls rip-cord to open parachute. D. Parachute is fully open. E. Contacts ground. velocity A B C D E time

v(t) (m/s) 39. Sketch the acceleration-versus-time graph from the following velocity-versus-time graph. Velocity vs. Time 10 864 2 0 -2. -4 -6 -8 -10- 0 Search this book 10 Q 1 1 I 20 30 40 50 60 70 80 90 100 Time (s)

1. The position and velocity for one-dimensional motion can be derived from the following equations: 1 Xf – Xị = Vịt +,at? 2 Vf = Vị + at Where, x; is the initial position, Xf is the final position, v; is the initial velocity, vf is the final velocity, a is the acceleration, and t is the time. Modify the above equations for the motion of free fall object. [Hints: Definition of free fall object: An object that is falling under the sole influence of gravity is called a free-falling object.]

An airplane needs to gain an acceleration of 0.79  m/s2  to take off on a  2000 m runway, what is the velocity ( i.e. final velocity) of the airplane just before it takes off? [Pay attention to the units in answer choices] A. 112 km/h B. 203 km/h C. 786 km/h D. 304 km/h   Please explain step by step and the equations used, thank you.

8. The tangent of a position time graph would yield: The average velocity of an object b. The instantaneous velocity of an object The velocity of an object over a small period of time d. The velocity of an object over a large period of time None of the above are true а. с. е.

2. A cart is moving at a constant 1 m/s on a straight track when a small ball is tossed vertically upward. Will the ball land in the cart? Explain the reasoning behind your answer and carefully state the assumptions you made in reaching your answers.