Question

calculate unknown force if object moves in direction of 50n ​

Answer 1

Here,

$F_{norm} = 80N \\ \\ thus \: \: it \: \: cancelled \: \: \: F_{grav} \: \: \: \: and \: \: \: the \\ F_{friction} \: \: \& \: \: F_{applied} \: \: gets \: \: subtracted \\ as \: \: they \: \: are \: \: in \: \: opposite \: \: direction \\ which \: \: gave \: \: 40N(50N - 10N).$

Hence,

$Body \: \: will \: \: move \: \: towards \: \: F_{applied}$