Elastic and Inelastic Collisions in One and Two Dimensions NEET Questions

Physics - Work, Energy, and Power

Elastic and Inelastic Collisions in One and Two Dimensions MCQ Questions


7.
A moving block having mass mmm collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, the coefficient of restitution eee will be:

NEET - 2018

A.
0.5
B.
0.25
C.
0.8
D.
0.4
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ANSWER :
A. 0.5
8.
During the short contact time of an elastic collision, the kinetic energy:
A.
Is constant throughout
B.
Increases then decreases
C.
Is NOT constant — temporarily stored as PE during contact
D.
Becomes zero
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ANSWER :
C. Is NOT constant — temporarily stored as PE during contact
9.
Mass m1 moving with v1i collides completely inelastically with stationary m2. The final common velocity vf is:
A.
m2·v1i / (m1 + m2)
B.
m1·v1i / (m1 + m2)
C.
(m1 + m2)·v1i / m1
D.
v1i / 2
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ANSWER :
B. m1·v1i / (m1 + m2)
10.
In a completely inelastic collision, mass m1 = m2 = m, initial speed of m1 is v. The final speed is:
A.
v
B.
v/2
C.
2v
D.
0
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ANSWER :
B. v/2
11.
The loss in kinetic energy in a completely inelastic collision (m1 moving, m2 at rest) is:
A.
½·m1·v1i²
B.
½·(m1·m2/(m1+m2))·v1i²
C.
m1·m2·v1i² / (m1+m2)
D.
½·m2·v1i²
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ANSWER :
B. ½·(m1·m2/(m1+m2))·v1i²
12.
A bullet of mass 10 g moving at 400 m/s embeds in a stationary block of mass 990 g. The final velocity of the combined system is:
A.
4 m/s
B.
40 m/s
C.
400 m/s
D.
0.4 m/s
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ANSWER :
A. 4 m/s