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Question Number 24893 by sushmitak last updated on 28/Nov/17

$$\mathrm{About}\mathrm{a}\mathrm{collision}\mathrm{which}\mathrm{of}$$$$\mathrm{the}\mathrm{following}\mathrm{are}\mathrm{not}\mathrm{correct}$$$$\mathrm{a}.\mathrm{Physical}\mathrm{touch}\mathrm{is}\mathrm{a}\mathrm{must}$$$$\mathrm{b}.\mathrm{Particles}\mathrm{cannot}\mathrm{change}$$$$\mathrm{c}.\mathrm{Effect}\mathrm{of}\mathrm{external}\mathrm{force}\mathrm{is}\mathrm{not}\mathrm{considered}$$$$\mathrm{d}.\mathrm{Momentum}\mathrm{may}\mathrm{or}\mathrm{may}\mathrm{not}\mathrm{change}$$$$\mathrm{multi}-\mathrm{correct}\mathrm{question}$$

Commented by ajfour last updated on 28/Nov/17

$$Physicaltouchmaynotbemust,$$$$sayincaseofcharges.$$$$Particlesdochangeinsay$$$$completelyinelasticcollision.$$$$sonotcorrect.$$$$externalforce{shouldn}^{\prime }tbe$$$$consideredandmomentum$$$$shouldnotchangeifsystem$$$$boundaryissochosenasto$$$$permitthese.$$

Commented by sushmitak last updated on 28/Nov/17

$$\mathrm{Thanks}\mathrm{you}\mathrm{very}\mathrm{much}\mathrm{Sir}\mathrm{for}$$$$\mathrm{the}\mathrm{explaination}.$$

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