1. –/2 points Giancoli7 2.P.008. Ask Your Teacher My Notes A horse canters away

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1.–/2 pointsGiancoli7 2.P.008.

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My Notes

A horse canters away from its trainer in a straight line, moving 160 m away in 15.0 s. It then turns abruptly and gallops halfway back in 4.5 s.

(a) Calculate its average speed.
m/s
(b) Calculate its average velocity for the entire trip, using "away from the trainer" as the positive direction.
m/s

In coming to a stop, a car leaves skid marks 81 m long on the highway. Assuming a deceleration of 8.00 m/s2, estimate the speed of the car just before braking.
m/s

The position of a race car, which starts from rest at t=0 and moves in a straight line, is given as a function of time in Problem 21, Chapter 2, Giancoli. (a) Plot x versus t. (b) What kind of functionality is this (e.g. linear)? (c) Of the four main kinematics equations, which one best describes this plot? (a) Keep the plot for yourself. (b) (c) Do not need to answer in WebAssign. answer partb) for me

Explanation / Answer

(a) Calculate its average speed.
Average Speed = Total Distance (240) / Total Time (19.5)
d = 160m + 80m = 240 m
t = 15.0s + 4.5 s = 19.5s

avg. speed = d/t
avg. speed= 240m / 19.5s
avg. speed = 12.31 m/s

(b) Calculate its average velocity for the entire trip, using "away from the trainer" as the positive direction.

average velocity = total displacement/total time

=80/19.5

=4.10m/s

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