1. Can we have zero acceleration yet the object is still moving? Explain please. 2. Can an object's acceleration be in the opposite direction to its motion? Explain please.

1. A stone is thrown vertically upward from the ground with a velocity of 15 m/sec. One second later another stone is thrown vertically upward with a velocity of 30 m/sec. When and how far above the ground will the stones be at the same level? 2. A train moving with constant acceleration travels 9 m during the 10 second of its motion and 6 m during the 12th second of its motion. Find its initial velocity and its constant acceleration. 3. A particle moves along a straight line in such a manner that its displacement, at any instant, from a fixed point on its path is given by the equation s 1/10 (t+ 6t-4t). How far will the particle travel during the 10h second?

I see that an object has is decelerating, what does this tell me about A? A. Nothing at all, what i see has nothing to do with A B. A is a positive C. A is a negative  D. A could be either, depending on the direction of the velocity Can I do the vertical part of a projectile motion problem separately from the horizontal part? A. Always.  Horizontal motion is completely separate from vertical motion though they share time B. Never.  C. Only under very special circumstances

A car moves around a path which is circular. Its speed is constant. Which of the following is TRUE? Select one: a. The car’s acceleration is zero. b. The car’s acceleration is constant. c. The car’s velocity is constant. d. The car’s velocity is directed toward the center.

1. A bus moves 150 m due North, then 100 m due South. What are the bus total distance and displacement?

A train, traveling at a constant speed of 22.0 m/s, comes to an incline with a constant slope. While going up the incline, the train slows down with a constant acceleration of magnitude 1.40 m/s². 1. What is the speed of the train after 7.40 s on the incline? 2.How far has the train traveled up the incline after 7.40 s?

Which of the following is/are ALWAYS TRUE? I. Displacement is a vector quantity that has a magnitude and direction that depends on the path taken. II. Average velocity is equal to instantaneous velocity when the acceleration is zero. III. Instantaneous velocity is the slope of the tangent line in the velocity vs. time graph. I only II only III only I and II only

2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.

1. A ball is thrown vertically upward from the ground with a speed of 36.0 m/s. Suppose the acceleration of gravity were only 2.00 m/s² instead of 9.80 m/s² a) At what time after being thrown does the ball have a velocity of 12.0 m/s upward? b) At what time does it have a velocity of 12.0 m/s downward? c) When is the velocity of the ball zero? d) When is the displacement of the ball zero? e) What are the magnitude and direction of the acceleration while the ball is moving upward? f) What are the magnitude and direction of the acceleration while the ball is moving downward? g) What are the magnitude and direction of the acceleration when it is at the highest point?

b