Question:

A stationary particle breaks into two parts of masses mA and mB which move with velocities vA and vB respectively. The ratio of their kinetic
energies (KB : KA) is : 

(1) Vb : Va 

(2) Mb : Ma

(3) Mb Vb : Ma Vb

(4) 1 : 1                                                        JEE-2024

Solution:                
A stationary particle breaks into two parts of masses mA and mB which move with velocities vA and vB respectively. The ratio of their kinetic energies (KB : KA) is : (1) Vb : Va (2) Mb : Ma (3) Mb Vb : Ma Vb (4) 1 : 1

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