2. 1D Motion / Kinematics

A horse trots away from its trainer in a straight line, moving 38 m away in 7.4 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed

If you are driving 85 km/h along a straight road and you look to the side for 2.0 s, how far do you travel during this inattentive period?

In an experiment, a shearwater (a seabird) was taken from its nest, flown $5150$ km away, and released. The bird found its way back to its nest $13.5$ days after release. If we place the origin at the nest and extend the $+x$–axis to the release point, what was the bird's average velocity in m/s for the return flight?

Larry leaves home at 9:05 and runs at constant speed to the lamppost seen in FIGURE EX2.1. He reaches the lamppost at 9:07, immediately turns, and runs to the tree. Larry arrives at the tree at 9:10. What is Larry's average velocity, in, during each of these two intervals?

Mikael runs with a constant speed of $3m/s$ for $45s$. How far does Mikael run?

Larry leaves home at 9:05 and runs at constant speed to the lamppost seen in FIGURE EX2.1. He reaches the lamppost at 9:07, immediately turns, and runs to the tree. Larry arrives at the tree at 9:10. What is Larry's average velocity for the entire run?

An object's average speed is found by dividing the total distance the object travels by the total $t$ what?

What is the average velocity of a cheetah that ran $100$ meters in $5.95$ seconds?

The position of an object along a straight tunnel as a function of time is plotted in Fig. 2–40. What is its average velocity between t = 25.0 s and t = 30.0 s?

Which formula can be used to calculate the average speed $v$ for steady motions?

A runner completes a $5$-mile race in $10$ minutes. What was her average speed?

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.75 s after the ball is released from his hands. What is the speed of the ball, assuming the speed of sound is 340 m/s?

Which of the following gives the correct formula for calculating speed?

(II) Digital bits on a 12.0-cm diameter audio CD are encoded along an outward spiraling path that starts at radius R₁ = 2.5 cm and finishes at radius R₂ = 5.8 cm. The distance between the centers of neighboring spiral-windings is 1.6 μm ( = 1.6 x 10^-6 m).

(a) Determine the total length of the spiraling path. [Hint: Imagine 'unwinding' the spiral into a straight path of width 1.6 μm, and note that the original spiral and the straight path both occupy the same area.]