Question

A body is thrown vertically upward with velocity 20m/s .How long time it remains in air? (g=10m/s2)

Answer 1

Answer:

$\boxed{\sf Time \ being \ in \ which \ body \ remains \ in \ air = 4 \ s}$

Given:

Velocity (u) = 20 m/s

Acceleration due to gravity (g) = 10 $\sf m/s^2$

To Find:

Time (t) being in which body remains in air.

Explanation:

Formula:

$\boxed{\bold{\sf t=\frac{2u}{g}}}$

Substituting values of u & g in the equation:

$\sf \implies t = \frac{2 \times 20}{10}$

$\sf \implies t =\frac{40}{10}$

$\sf \implies t =\frac{4 \times \cancel{10}}{ \cancel{10}}$

$\sf \implies t = 4 \ s$

$\therefore$

Time (t) being in which body remains in air = 4 seconds

Answer 2

I don’t know, it depends if they have a parachute and can deploy it quickly enough. If they do, the drag and air resistance would gently bring them down at a much slower pace than freefalling. Not enough information to solve this.