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


13.
For a 1D elastic collision (m1 moving with v1i, m2 at rest), the final velocity of m1 is:
A.
2m1·v1i / (m1+m2)
B.
(m1−m2)·v1i / (m1+m2)
C.
(m1+m2)·v1i / m1
D.
v1i
😑 View Answer Rough Work Error
ANSWER :
B. (m1−m2)·v1i / (m1+m2)
14.
For a 1D elastic collision (m1 moving with v1i, m2 at rest), the final velocity of m2 is:
A.
(m1−m2)·v1i / (m1+m2)
B.
2m2·v1i / (m1+m2)
C.
2m1·v1i / (m1+m2)
D.
v1i
😑 View Answer Rough Work Error
ANSWER :
C. 2m1·v1i / (m1+m2)
15.
In a 1D elastic collision between equal masses (m1 = m2 = m), m1 moves with v and m2 is at rest. After collision:
A.
Both move with v/2
B.
Both reverse direction
C.
m1 reverses; m2 stays at rest
D.
m1 comes to rest; m2 moves with v
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ANSWER :
D. m1 comes to rest; m2 moves with v
16.
In a 1D elastic collision, if m2 >> m1 (m2 is very heavy, at rest), what happens to m1?
A.
m1 stops; m2 moves forward
B.
m1 moves forward faster
C.
Both move forward with the same speed
D.
m1 reverses with approximately same speed; m2 is undisturbed
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ANSWER :
D. m1 reverses with approximately same speed; m2 is undisturbed
17.
In a 1D elastic collision, if m1 >> m2 (m1 is very heavy, m2 at rest), what approximately happens?
A.
m1 stops; m2 moves with 2v1i
B.
m1 reverses; m2 stays
C.
Both stop
D.
m1 continues with ≈ v1i; m2 moves with ≈ 2v1i
😑 View Answer Rough Work Error
ANSWER :
D. m1 continues with ≈ v1i; m2 moves with ≈ 2v1i
18.
The key relationship between initial and final velocities in a 1D elastic collision (from NCERT Eq. 5.25) is:
A.
v2f = v1i − v1f
B.
v1f + v2f = v1i
C.
v2f = 2v1i
D.
v2f = v1i + v1f
😑 View Answer Rough Work Error
ANSWER :
D. v2f = v1i + v1f