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8 Apr 2009 11:35:44 IST

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assertn-reasn prblm 1. The total energy of a system is always conserved irrespective of whether ext

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assertn-reasn prblm1. The total energy of a system is always conserved irrespective of whether external forces act on the system.2 If external forces act the total momentum and energy will increase.

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lakshmi s

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8 Apr 2009 11:54:33 IST

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first one is false

Akash

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8 Apr 2009 12:01:02 IST

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assertion holds only in the absence of external forces

AIR 538 Asish

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8 Apr 2009 15:24:30 IST

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both Assertion as well as reason FALSE

Aarti Verma

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8 Apr 2009 16:11:53 IST

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give reasons please..........

Abhishek roy

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8 Apr 2009 20:09:42 IST

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GOING BY THE WORDINGS OF THE QUESTION TOTAL ENERGY HERE DOES NOT MEAN MECHANICAL ENERGY .IN ANY CASE OTHER THAN CASES OF NUCLEAR PHYSICS , TOTAL ENERGY OF ANY SYSTEM IS CONSERVED .IF EXTERNAL FORCES DONT ACT ADDITIONAL MECHANICAL ENERGY IS CONSERVED .SECOND PART : CONSIDER FRICTION IT DECREASES THE MOMENTUM IN A NUMBER OF CASES SO ASSERTION IS TRUE REASON IS FALSE .

Sunny Shah

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8 Apr 2009 20:12:43 IST

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I agree with abhishek. Assertion is true and reason is false.

akshay A NEW BEGINNING...

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8 Apr 2009 21:32:58 IST

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AND HERE COMES MY 1000TH POST.................

ANS MUST BE BOTH ASSERTION AND REASON ARE WRONG.

BECAUSE IF EXTERNAL FORCES ACT ENERGY IS NOT CONSERVED ..HENCE ASSERTION IS WRONG

ALSO IF EXTERNAL FORCES ACT MOMENTUM AND ENERGY MAY INCREASE OR DECREASE..

HENCE REASON IS WRONG. .

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