Suppose the block of the previous problem is pushed down the incine witas force of 4N. How far will the block move in the first two seconds after starting from rest? The mass of the block is 4 kg.

Explanation

From the free bodyi diagram `4-4-muR+4gsin 30^0=0`………i
`R-4g cos 30^0=0`………ii
`rarr R=4g cos 30^0=0`

Putting the values of R in equation i. we get
`4-0.11xx4gcos 30^0+4gsin30^0=0`
`rarr 4-4a-0.11xx4xx10xxsqrt3/2+4xx10xx1/2`
`rarr 4-4a-3.81+20=0`
`rarr 4-4a-318+20=0`
`rarr a~~5m/s^2`
`:. Distance, S=ut=-1/2at^2`
`=0+(1/2)5xx2^2`
`=10 m` Hence the bock wil move 10 m