2 Kinematics - BC Science Physics 11

2.4 Review Questions
1. On a certain asteroid, a steel ball drops a distance
of 0.80 m in 2.00 s from rest. Assuming uniform
acceleration due to gravity on this asteroid, what is
the value of g on the asteroid?
2. The graph below represents the velocity of a ball
thrown straight up by a strong pitcher as a function
of time. In the first part of the graph ending at
A, the ball is accelerated to 39.2 m/s in a time of
0.20 s. After the ball leaves the pitcher’s hand, it
experiences only the acceleration due to gravity
until it is caught in a glove and brought to rest in the
hand of the catcher.
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(a) What is the acceleration of the ball while it is
being thrown?
(b) What is the acceleration of the ball after it leaves
the pitcher’s hand? (ABC)
(c) What is the acceleration of the ball while it is
being caught? (CD)
(d) What point on the graph (A, B, C, or D)
corresponds with the instant when the ball is at
the peak of its flight? Explain your answer.
(e) Why is the slope of the graph negative as soon
as the ball leaves the pitcher’s hand?
(f) Why is the graph labelled velocity rather than
speed?
(g) How far up did the ball travel?
(h) How far down did the ball fall?
(i) What is the average velocity of the ball for the
whole trip from pitcher’s hand to catcher’s
hand?
3. A body in free fall accelerates at a rate of 9.81 m/s 2 at
your latitude. How far does the body fall during
(a) the first second? (b) the second second? (Think
first!)
68 Chapter 2 Kinematics © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6