NDA 2019 Physics question
Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement/s is/are correct ? 1. Chemical reactions happening in the system cannot change the velocity v of the center of mass of the object. 2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the center of mass of object. Select the correct answer using the code given below :
Solution
A chemical reaction involves only internal forces, and internal forces cannot change the total momentum of a system, so the velocity of the centre of mass stays the same
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