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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 $m_{A} = 5 k g$
Force $F = m a \Rightarrow a = 2 m / s^{2}$
When block A moves, block B remains at rest
Distance B to separate from block A is 20cm
$\Rightarrow S = u t + \frac{1}{2} a t^{2}$
$0.2 = 0 + \frac{1}{2} \times 2 \times t^{2}$
$t = 0.45 \sec$

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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_______________