Question

A box of mass 2 kg lies on a rough horizontal floor, coefficient of
friction 0-5. A light string is attached to the box in order to pull the box
across the floor.
If the tension in the string is T N. find the value that T must exceed for
motion to occur if the string is:
(a ) horizontal
(b) 30 above the horizontal
(c) 30 below the horizontal.

Answer 1

a-2
$a -( 2 \times 10) \times 0.5 = 10newton$