Question

The two disks *A* and *B* have a mass of 4 kg and
5 kg , respectively. They collide with the initial velocities
shown. The coefficient of restitution is *e* = 0.7. Suppose
that (*v**A*)1 = 6 m/s ,(*v**B*)1 = 7
m/s .

**Part A**

Determine the magnitude of the velocity of *A* just after
impact.

**Part B**

Determine the angle between the *x* axis and the velocity
of *A* just after impact, measured clockwise from the
negative *x* axis.

**Part C**

Determine the magnitude of the velocity of *B* just after
impact.

**Part D**

Determine the angle between the *x* axis and the velocity
of *B* just after impact, measured clockwise from

Answer #1

Consider the following two blocks A and B with the mass of
ma= 7 kg and mb = 4 kg.
They are moving in the same direction along the x-axis on a
horizontal frictionless surface with initial velocities
vai= 30 m/s and vbi= 20
m/s. The two blocks collide head-on and there is no change in the
line of motion of either object. If the collision is elastic, find
the final velocity of block A.

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A 0.30-kg puck, initially at rest on a frictionless horizontal
surface, is struck by a 0.20-kg puck that is initially moving along
the x-axis with a velocity of 8.5 m/s. After the
collision, the 0.20-kg puck has a speed of 5.1 m/s at an angle
of
θ = 53°
to the positive x-axis.
(a) Determine the velocity of the 0.30-kg puck after the
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magnitude
m/s
direction
° from the positive x-axis
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Two ice skaters, Daniel (mass 65 kg) and Rebecca (mass 45 kg),
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Two 1.7 kg bodies, A and B, collide. The
velocities before the collision are A = (14 +
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(a) What is the final velocity of B?
=
m/s
(b) What is the change in the total kinetic energy (including
sign)?
J

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