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Units and Measurement
Question
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A bomb of mass M at rest explodes into many fragments so that kinetic energy released is K. What is the velocity of centre of mass of fragments?

Answer

Before the explosion happened, the bomb is at rest. Therefore, the velocity of the centre of mass of fragment after the explosion is zero. Velocity remains constant. 

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Some More Questions From Units and Measurement Chapter

What is measurement?

What is the need of measurement?

Define physical quantity.

 

Give four examples of physical quantities.

Define unit.

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?