What is the property that causes the velocity of a body to remain constant unless an external force is applied ?

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Q: 95 (CDS-I/2006)
What is the property that causes the velocity of a body to remain constant unless an external force is applied ?

question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,12,14,7,1,6,12

keywords: 

{'external force': [0, 0, 1, 0], 'velocity': [0, 2, 2, 6], 'inertia': [0, 0, 4, 3], 'elasticity': [1, 0, 2, 2], 'momentum': [0, 1, 0, 3], 'surface tension': [0, 0, 2, 3], 'property': [15, 0, 8, 22], 'body': [27, 3, 23, 37]}

The correct answer is option 4- Inertia. Inertia is a property of matter that causes an object to resist changes in its motion. It is directly related to Newton`s First Law of Motion, which states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity, unless acted upon by an external force.

Option 1- Momentum is not the correct answer. Momentum is a property that is related to the mass and velocity of an object in motion. It is a vector quantity and is given by the equation momentum = mass x velocity.

Option 2- Elasticity is also not the correct answer. Elasticity is the property of a material that allows it to regain its shape after being deformed by an external force. It is not directly related to the velocity of a moving body.

Option 3- Surface tension is not the correct answer either. Surface tension is the property of a liquid that allows it to resist an external force and maintain a minimal surface area. It is not related to the velocity of a body.

In conclusion, the property that causes the velocity of a body to remain constant unless an external force is applied is inertia.