Momentum and CollisionHardBloom L3
Question
Two blocks A & B are placed on a smooth surface as shown, horizontal force F is applied on B when A & B are initially at rest. Friction between A & B is absent (in subsequent motion):
Options
A.Kinetic energy of system of A & B increases
B.Momentum of the system of A & B remains constant in frame of center of mass of A & B
C.Kinetic energy of system of A & B remain constant in frame of center of mass of A & B
D.Kinetic energy of A remains constant in B frame
Solution
Sol. $\because$ External force does some positive work.
⇒ KE of system increases.
$\because$ In com frame, force on system is zero.
⇒ Momentum conservation in com frame.
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