Using the minimum travel time and the straight-line distance, determine the magnitude (size) only of the average velocity for the trip. DO NOT worry about the direction.

Straight-line Distance: 378.43km

Time: 1 hour, 11 minutes, 50 seconds

 

a car travels along a straight line at a constant of speed 60.5 mi/h for a distance d and then another distance d in the same direction at another constant speed. The average velocity for the entire trip is 26.0 mi/h. What is the constant speed with which the car moved during the second distance d?

The Gravitational force exerted on a baseball is 2.21N. A pitcher throws the ball horizontally with a velocity 18 m/s by uniformly accelerating it along a straight horizontal line for a time interval of 170ms. The ball starts from rest 

(a) Through what distance does it move before it release?

(b) What are the magnitude and direction of the force the pitcher exerts on the hall?  

A common graphical representation of motion along a straight line is the v vs. t graph, that is, the graph of (instantaneous) velocity as a function of time. In this graph, time is plotted on the horizontal axis and velocity on the vertical axis. Note that by definition, velocity and acceleration are vector quantities. In straight-line motion, however, these vectors have only a single nonzero component in the direction of motion. Thus, in this problem, we will call the velocity and the acceleration, even though they are really the components of the velocity and acceleration vectors in the direction of motion, respectively. Here is a plot of velocity versus time for a particle that travels along a straight line with a varying velocity. Refer to this plot to answer the following question.

What is the average acceleration of the particle over the first 20.0 seconds?