- 1(current)
Q. No.Bob \(B\) of mass \(m\) at rest is hanging vertically from the ceiling via a massless string of length \(10~\text{m},\) as shown in the figure. Point mass \(A\) of mass \(m\) travelling horizontally with speed \(10\) m/s hits bob \(B\) elastically. The bob \(B\) rises \(h\) meter after the collision. Taking the acceleration due to gravity \(g=10\) m/s2 and neglecting the size of the bob, the value of \(h\) is:
1. \(2.5\)
2. \(8\)
3. \(7\)
4. \(5\)
1. \(2.5\)
2. \(8\)
3. \(7\)
4. \(5\)
Subtopic: Â Collisions |
 66%
Level 2: 60%+
NEET - 2026
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Two bodies \(A\) and \(B\) of the same mass undergo completely inelastic one-dimensional collision. The body \(A\) moves with velocity \(v_1\) while the body \(B\) is at rest before collision. The velocity of the system after collision is \(v_2.\) The ratio of \(v_1:v_2\) is:
1. \(2:1\)
2. \(4:1\)
3. \(1:4\)
4. \(1:2\)
1. \(2:1\)
2. \(4:1\)
3. \(1:4\)
4. \(1:2\)
Subtopic: Â Collisions |
 64%
Level 2: 60%+
NEET - 2024
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A bullet of mass \(m\) hits a stationary block of mass \(M\) elastically. The transfer of energy is the maximum, when:
| 1. | \(M=m\) | 2. | \(M=2m\) |
| 3. | \(M\ll m\) | 4. | \(M\gg m\) |
Subtopic: Â Collisions |
 59%
Level 3: 35%-60%
NEET - 2023
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A particle of mass \(4M\) at rest splits into two particles of mass \(M\) and \(3M.\) The ratio of the kinetic energies of mass \(M\) and \(3M\) would be:
| 1. | \(3:1\) | 2. | \(1:4\) |
| 3. | \(1:1\) | 4. | \(1:3\) |
Subtopic: Â Collisions |
 66%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
| Assertion (A): | When a firecracker (rocket) explodes in mid-air, its fragments fly in such a way that they continue moving in the same path, which the firecracker would have followed, had it not exploded. |
| Reason (R): | The explosion of cracker (rocket) occurs due to internal forces only and no external force acts for this explosion. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Collisions |
Level 3: 35%-60%
NEET - 2022
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Body \(\mathrm{A}\) of mass \(4m\) moving with speed \(u\) collides with another body \(\mathrm{B}\) of mass \(2m\) at rest. The collision is head-on and elastic in nature. After the collision, the fraction of energy lost by the colliding body \(\mathrm{A}\) is:
| 1. | \(\dfrac{5}{9}\) | 2. | \(\dfrac{1}{9}\) |
| 3. | \(\dfrac{8}{9}\) | 4. | \(\dfrac{4}{9}\) |
Subtopic: Â Collisions |
 66%
Level 2: 60%+
NEET - 2019
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