1. A boy lets go of a tree limb and falls freely. What is his speed at the end of 0.50s?

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter2: Representing Motion
Section: Chapter Questions
Problem 67A
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Directions: It is a Problem-Solving test, thus, you need to show your solutions in solving
the problem.
1. A boy lets go of a tree limb and falls freely. What is his speed at the end of 0.50s?
2. A ball is thrown upward with an initial speed of 80 ft/s. How high does it go?
3. Suppose a car is moving in a straight line and steadily increases its speed. It
moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the
next second. What is the car's acceleration?
4. A car accelerates at 2 m/s/s. Assuming the car travels from rest, how much time
does it need to accelerate to a speed of 30 m/s?
5. A man driving his car into a 20.0-foot garage with a velocity of 20.0 mi/h applies
the brakes, producing a constant deceleration.
Find a) the smallest deceleration necessary to avoid striking the back wall of the
garage; and
b) how many seconds it takes for the car to come to rest?
Transcribed Image Text:Directions: It is a Problem-Solving test, thus, you need to show your solutions in solving the problem. 1. A boy lets go of a tree limb and falls freely. What is his speed at the end of 0.50s? 2. A ball is thrown upward with an initial speed of 80 ft/s. How high does it go? 3. Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration? 4. A car accelerates at 2 m/s/s. Assuming the car travels from rest, how much time does it need to accelerate to a speed of 30 m/s? 5. A man driving his car into a 20.0-foot garage with a velocity of 20.0 mi/h applies the brakes, producing a constant deceleration. Find a) the smallest deceleration necessary to avoid striking the back wall of the garage; and b) how many seconds it takes for the car to come to rest?
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