A block of mass `m = 4.4 kg` lies on a horizontal rough surface. The coefficient of friction between the block and the surface is `mu = 0.5`. A force `F` starts acting on the block making an angle `theta = 37^(@)` to the horizontal. The force changes with time as shown in the graph.
(a) At what time the block begins to move ?
(b) Calculate the maximum speed attained by the block.
`[tan 37^(@)=(3)/(4) ,g = 10 ms^(-2)]`

Answer

(a) 5 s
(b) 25 `ms^(-1)`