A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second bod…

Question

A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body?

Accepted Answer

Correct answer: D. (d) JEE Main 2019 For head on elastic collision we have V_1= (m_1-m_2)u_1m_1+m_2+ 2m_2u_2m_1+m_2 Here m_1=2 kg ,u_1=x ,u_2=0 v_1= x4 ∴ x4= (2-m_2)x2+m_2 ⇒m_2=1.2 kg

$A body of mass 2 kg makes an elastic collision with a second body at rest and continues to move in the original direction but with one fourth of its original speed. What is the mass of the second body?$

Solution

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