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Bhaagwat sharma   from Manav rachna international., ludhiana
Subject :Physics    Class : Class 9

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Hemang   from Kensri, Bangalore
Subject :Physics    Class : Class 9

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : A quick collision between two bodies is more violent than a slow collision, even when the initial and the final velocities are identical.
Reason : Because the rate of change of momentum which determines the force is greater in the first case.

A If both Assertion and Reason are true and Reason is the correct explanation of Assertion
B If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C If Assertion is true but Reason is false
D If both Assertion and Reason are false.


disagree with the answer and th explanation provided

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chinmoy   from birla divya jyoti, siliguri
Subject :Physics    Class : Class 8

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Subject :Physics    Class : Class 8

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Harsh   from Parle Tilak Vidyalaya ICSE, Mumbai
Subject :Physics    Class : Class 8

Ans 1:

TejasviKarri   from DPS Nacharam, Hyderabad
Class : >Class 8
20

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Poonam Mam   from DPS Noda, Noida
Subject :Physics    Class : Class 10

Ans 1:

bikash   from Tigps, Bolpur Birbhum West Bengal
Class : >Class 8
20

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  from ,
Subject :Physics    Class : Class 8

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  from ,
Subject :Physics    Class : Class 8

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  from ,
Subject :Physics    Class : Class 10

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Smita   from Suncity World School, Gurgaon
Subject :Physics    Class : Class 7

'An object may be in the rest as well as in the motion at the same time'. Which one of the following is correct explanation for the above statement?

A Rest and motion are defined on basis of position of an object. So a body may be in rest and in the motion at the same time.
B Object is in rest or in motion depends on the reference point. An object may be in motion with respect to a reference point and at same time the object may be in rest with respect to another reference point.
C Rotatory motion justifies the above statement. In the rotatory motion, object rotates around a fixed axis and does not cover distance. Therefore, object is in motion and in the rest at the same time.
D No, it is not possible that an object is in the motion and in the rest as well.

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