Exam 2: Motion Along a Line

You drive your car 5.0 km due east at 35 km/hr and suddenly realize that you forgot your wallet. So, you return home, driving west at 40 km/hr, and upon arrival you spend 10 minutes looking for it. Finally, you get back on the road and drive a total of 57.0 km due east. If your average velocity was 40 km/hr for the whole journey, what was your average speed during the last leg?

A mouse is running away from a cat at a speed of 0.75 m/s. At a distance of 1.25 m from his mouse hole, the mouse accelerates at a constant rate until he reaches his hole safely, 0.75 s later. What was the mouse's acceleration during the final 1.25 m of his escape?

The figure shows the graph of v_x versus time for an object moving along the x-axis. Solve graphically for the distance traveled between t = 5.0 s and t = 9.0 s.

A sprinter runs 100 m. If he travels at constant acceleration of 1.95 m/s² for the first 6.0 s and then at constant velocity for the remaining time, what was his average velocity?

A walker walks 30 m from the origin toward the WEST to point A. She then walks from point A, 20 m more toward the EAST to point B. The walker's total displacement from the origin is

A ball is thrown straight up with an initial speed of 30 m/s. What is its speed after 4.2 s?

A runner starts from rest and with an acceleration of 1.0 m/s² travels a distance of 10 meters. The time it takes the runner to cover the distance is

Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?