Physics

Problem

Two smooth blocks of masses

1\,\text{kg}

and

2\,\text{kg}

slide towards each other with speeds

2\,\text{m s}^{-1}

and

1\,\text{m s}^{-1}

respectively on a friction-free horizontal surface. They collide head-on and stick together. Which one of the following quantities is certainly conserved during the impact? a) Only kinetic energy b) Neither linear momentum nor kinetic energy c) Only linear momentum d) Both linear momentum and kinetic energy

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