A person starts at point P, stays there for a second, then runs at a constant rate to Q, stays there for a second, and then runs back to P at a constant velocity. Sketch the: a) velocity versus time graph b) position versus time graph

An object goes from one point in space to another An object goes from one point in space to another. After it arrives at its destination, its displacement is: a) either greater than or equal to b) always greater than c) always equal to d) either smaller than or equal to the distance it traveled.

A marathon runner runs at 15 km/hr. When the runner is 7 A marathon runner runs at 15 km/hr. When the runner is 7.5 km from the finish, a bird begins to fly from the runner to the finish line at 30 km/hr. When the bird reaches the finish line, it turns around and flies back to the runner and repeats these trips until the runner finishes the race. How many km does the bird travel? a) 10 km b) 15 km c) 20 km d) 30 km 30 km/hr 15 km/hr

If you drop an object in the absence of air resistance, it accelerates downward at 9.8m/s2. If instead you throw it downward, its downward acceleration after release is: a) less than 9.8m/s2. b) 9.8m/s2. c) more than 9.8m/s2.

A person standing on the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed is the one initially thrown: a) upward b) downward c) neither, they hit at the same speed

A train car moves along a long straight track A train car moves along a long straight track. The graph shows the position as a function of time for this train. The graph shows that the train: a) speeds up all the time b) slows down all the time c) speeds up part of the time and slows down part of the time d) moves at constant velocity

The graph shows a position versus time graph for two trains running on parallel tracks. Which is true? a) At time T, both trains have the same velocity. b) Both trains speed up all the time. c) Both trains have the same velocity at some time before T. A B Position (x) Time (sec) T

You are throwing a ball straight up in the air You are throwing a ball straight up in the air. At the highest point, the ball’s: a) velocity and acceleration are zero. b) velocity is nonzero; acceleration is zero. c) acceleration is nonzero; velocity is zero. D) velocity and acceleration are nonzero.

A cart on a roller coaster rolls down the track as shown A cart on a roller coaster rolls down the track as shown. As the cart rolls beyond the point shown, what happens to its speed and acceleration in the direction of motion? A) Both decrease. B) Speed decreases, but acceleration increases. C) Both remain constant. D) Speed increases, but acceleration decreases. E) Both increase.

ANSWERS 1 2. D 3. B 4. B 5. C 6. B 7. C 8. C 9. D