A tourist drops a rock from rest from a guard rail overlooking a valley. What is the velocity of the rock at 4.0 s? What is the displacement of the rock at 4.0 s? 1.

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter2: Newtonian Mechanics-single Particle
Section: Chapter Questions
Problem 2.6P: In the blizzard of ’88, a rancher was forced to drop hay bales from an airplane to feed her cattle....
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The equations of kinematics for uniform acceleration
also apply to the special case of an object that is
accelerating near the earth's surface. The gravitational
pull of the earth on any object will cause it to
accelerate towards the centre of the earth at a rate of
9.80 m/s², assuming air resistance is negligible. Thus,
for any equations involving a body in free fall
(something that is dropped or thrown) we can use the
same problem-solving skills we already have. There
are a few unique features to solving freefall problems.
acceleration is always constant at g = -9.80
m/s? (the negative is very important)
at the top of its flight, an object has v =
(Since it must stop before starting to come
down again)
keeping your sign conventions for direction is
very important...all velocity directed down
must be negative, and all velocity directed up
must be positive.
b)
= 0.
A tourist drops a rock from rest from a guard
rail overlooking a valley. What is the velocity
of the rock at 4.0 s? What is the displacement
1.
of the rock at 4.0 s?
Transcribed Image Text:The equations of kinematics for uniform acceleration also apply to the special case of an object that is accelerating near the earth's surface. The gravitational pull of the earth on any object will cause it to accelerate towards the centre of the earth at a rate of 9.80 m/s², assuming air resistance is negligible. Thus, for any equations involving a body in free fall (something that is dropped or thrown) we can use the same problem-solving skills we already have. There are a few unique features to solving freefall problems. acceleration is always constant at g = -9.80 m/s? (the negative is very important) at the top of its flight, an object has v = (Since it must stop before starting to come down again) keeping your sign conventions for direction is very important...all velocity directed down must be negative, and all velocity directed up must be positive. b) = 0. A tourist drops a rock from rest from a guard rail overlooking a valley. What is the velocity of the rock at 4.0 s? What is the displacement 1. of the rock at 4.0 s?
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