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NEET
Exam
NEET
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Physics
Chapter
Center of Mass, Momentum and Collision

NEET · Physics · Center of Mass, Momentum and Collision

Two bodies, A and B, are moving with uniform velocities. The ratio...

Two bodies, A and B, are moving with uniform velocities. The ratio of their masses is 1:41 : 4 and the ratio of their linear momenta is 2:12 : 1. The ratio of the distances covered by them in the same time interval is:

Options

  1. A1:21 : 2
  2. B1:81 : 8
  3. C2:12 : 1
  4. D8:18 : 1

Correct answer

D. 8:18 : 1

Step-by-step solution

Let the masses of bodies A and B be mAm_{\text{A}} and mBm_{\text{B}}, and their linear momenta be pAp_{\text{A}} and pBp_{\text{B}}.

Given:
mAmB=14\dfrac{m_{\text{A}}}{m_{\text{B}}} = \dfrac{1}{4}
pApB=21\dfrac{p_{\text{A}}}{p_{\text{B}}} = \dfrac{2}{1}

The velocity of a body is given by v=pmv = \dfrac{p}{m}.
The distance covered in time tt is d=v×t=pm×td = v \times t = \dfrac{p}{m} \times t.

Since the time interval tt is the same for both bodies, the ratio of distances covered is:
dAdB=pA/mApB/mB=(pApB)×(mBmA)\dfrac{d_{\text{A}}}{d_{\text{B}}} = \dfrac{p_{\text{A}} / m_{\text{A}}}{p_{\text{B}} / m_{\text{B}}} = \left( \dfrac{p_{\text{A}}}{p_{\text{B}}} \right) \times \left( \dfrac{m_{\text{B}}}{m_{\text{A}}} \right)

Substituting the given values:
dAdB=(21)×(41)=81\dfrac{d_{\text{A}}}{d_{\text{B}}} = \left( \dfrac{2}{1} \right) \times \left( \dfrac{4}{1} \right) = \dfrac{8}{1}

Hence, the ratio of the distances covered is 8:18 : 1.

Answer: 8:18 : 1
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