An object of mass $5\, kg$ is thrown vertically upwards from the ground. The air resistance produces a constant retarding force of $10\, N$ throughout the motion. The ratio of time of ascent to the time of descent will be equal to $\left[\right.$Use $g =10 \,ms ^{-2}]$
$1: 1$
$\sqrt{2}: \sqrt{3}$
$\sqrt{3}: \sqrt{2}$
$2: 3$
In Newtonian mechanics which parameter apply external force ?
Which of the following sets of concurrent forces may be in equilibrium
The ends of a rope are held by two men who pulls on it with equal and opposite forces of magnitude $F$ each. Then the tension in the rope is