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Q.

A small block B assumed to be point mass is placed on another block A of mass 5kg and length 20cm. Initially the block B is near the right end of block A. A constant horizontal force of 10N is applied to the block A. All the surfaces are assumed frictionless. Find the time elapsed before the block B separated from A in milliseconds is_______________
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answer is 447.

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Detailed Solution

mass mA=5kg  
Force F=ma⇒a=2m/s2  
When block A moves, block B remains at rest 
Distance B to separate from block A is 20cm
⇒S=ut+12at2 
0.2=0+12×2×t2 
t=0.45sec 

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