A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book ............ $^o$
$0$
$30$
$45$
$180$
A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book ............ $^o$
Since action and reaction acts in opposite direction on same line, hence angle between them is $180^°$.