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A 6 kg blocks is kept over a rough surfa...

A `6 kg` blocks is kept over a rough surface with coefficients of friction `mu_(s)=0.6` and `mu_(k)=0.4` as shown in figure. A time varying force `F=4t` ( `F` in newton and `t` in second) is applied on the block as shown. Find the acceleration of block at `t=5 sec`. ( Taking `g=10 m//s^(2)`)

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The correct Answer is:
0
`mu_(s) = 0.6 " " mu_(k) = 0.4`

Block will start when 4t = `mu_(s) ` Mg
so , `t = (mu_(s) "Mg")/(4) = 9` second
so , at t = 5 second , block will be stationary.
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