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Chapter 7 Linear Momentum
4.
A 30.00 kg mass falls from a height of 4.000 m. The momentum of the mass just before it hits the ground is:
A.
144.2 kg
•
m/s.
B.
187.8 kg
•
m/s.
C.
320.0 kg
•
m/s.
D.
442.4 kg
•
m/s.
E.
502.1 kg
•
m/s.
5.
A 3.000 kg ball is pitched with a kinetic energy of 20.00 Joules. Then the momentum of the ball is:
A.
7.500 kg
•
m/s.
B.
8.350 kg
•
m/s.
C.
9.450 kg
•
m/s.
D.
10.95 kg
•
m/s.
E.
12.50 kg
•
m/s.
6.
If the momentum of a ball is doubled, then the kinetic energy is:
A.
0.5 times larger.
B.
2 times larger.
C.
3 times larger.
D.
4 times larger.
E.
5 times larger.
8.
A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a
velocity of 4.0 m/s. The magnitude of the change in momentum of the ball is:
A.
8.0 kg
•
m/s.
B.
13 kg
•
m/s.
C.
26 kg
•
m/s.
D.
30 kg
•
m/s.
E.
36 kg
•
m/s.

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10.
A 4.00 kg ball is traveling at 3.00 m/s and strikes a wall. The 4.00 kg ball bounces off the wall with a
velocity of 4.0 m/s. If the contact with the wall by the ball lasts for 0.10 seconds, then the average force on the
ball is:
A.
230 N.
B.
280 N.
C.
320 N.
D.
360 N.
E.
400 N.
11.
A 5.00 kg ball is moving at 4.0 m/s to the right and a 6.00 kg ball is moving at 3.00 m/s to the left. The total
momentum of the system is:
A.
2.0 kg
•
m/s to the right.
B.

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