[J87/11/9] A body A of mass m moving with velocity u makes an elastic head-on collision with an identical body B which is initially at rest. (a) Describe in words the motion of the bodies after the collision. (b) The elastic collision mentioned above is one in which the bodies become temporarily compressed and remain in contact for a short time. On the same axes of velocity against time, sketch labelled graphs of velocity of A and the velocity of B. The time axis should extend from a time before the bodies come into contact to a time after they separate; mark on this axis the time to at which they first touch, the time to at which they suffer maximum compression and the time ts at which they separate. (c) Explain why bodies have the same velccity at to (the time of maximum compression).

Principles of Physics: A Calculus-Based Text
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Chapter8: Momentum And Collisions
Section: Chapter Questions
Problem 6OQ: A 2-kg object moving to the right with a speed of 4 m/s makes a head-on, elastic collision with a...
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Part a
[J87/I1/9]
A body A of mass m moving with velocity u makes an elastic head-on collision with an identical
body B which is initially at rest.
(a)
Describe in words the motion of the bodies after the collision.
(b) The elastic collision mentioned above is one in which the bodies become
temporarily compressed and remain in contact for a short time. On the same axes
of velocity against time, sketch labelled graphs of velocity of A and the velocity of
B. The time axis should extend from a time before the bodies come into contact to
a time after they separate; mark on this axis the time tc at which they first touch,
the time to at which they suffer maximum compression and the time ts at which they
separate.
(c) Explain why bodies have the same velccity at to (the time of maximum
compression).
(d) What is the velocity of the two bodies at fo?
(e) Hence, find in terms of m and u, the total kinetic energy of the bodies at to and
again at a time after they have completely separated.
(f)
Account for the difference between the energies in (e).
Transcribed Image Text:[J87/I1/9] A body A of mass m moving with velocity u makes an elastic head-on collision with an identical body B which is initially at rest. (a) Describe in words the motion of the bodies after the collision. (b) The elastic collision mentioned above is one in which the bodies become temporarily compressed and remain in contact for a short time. On the same axes of velocity against time, sketch labelled graphs of velocity of A and the velocity of B. The time axis should extend from a time before the bodies come into contact to a time after they separate; mark on this axis the time tc at which they first touch, the time to at which they suffer maximum compression and the time ts at which they separate. (c) Explain why bodies have the same velccity at to (the time of maximum compression). (d) What is the velocity of the two bodies at fo? (e) Hence, find in terms of m and u, the total kinetic energy of the bodies at to and again at a time after they have completely separated. (f) Account for the difference between the energies in (e).
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