Question

with what velocity should a body be thrown vertically upward so that it reaches a height of 25 m ? for how long will it be in the air ​

Answer 1

Let 25 m be considered as maximum height.

As it is a vertically upward projection,you must be aware of the formula,

H=u^2/2g.

25=u^2/2×10 (consider g=10m/s^2)

25×2×10=u^2

u^2=500

u=10 under root 5

Time taken for it to be in the air will be the time taken to go up and down it's path.

So T=2u/g

T=(2×10 under root 5)/10

T=(2 under root 5) seconds.

This must be your answer if I am correct.

If any doubts feel free to ask.

Hope my answer helped you:)