Question

A stone is thrown vertically upward with a velocity of 25 m/s how long it takes to reach the maximum height. Also calculate the height.​

Answer 1

$\huge \color{purple} \mathcal{ \colorbox{green}{\colorbox{white}{Solution}}}$

${\sf\bold{Here~v~=~0~m/s}}$

${\sf\bold{u~=~25~m/s}}$

${\sf\bold{g~=~-10}}$

${\sf\bold{height~=~?}}$

$\large\blue{\sf{v²~-~u²~=~2gh}}$

${\sf\bold{0²~-~25²~=~2~×~-10~×~h}}$

${\sf\bold{-225~=~-20~h}}$

${\sf\bold{h~=~11.25}}$

$\large{\sf{.°.~Height~=~11.25~m}}$

$\large\blue{\sf{v~=~u~+~gt}}$

${\sf\bold{0~=~25~+~(-10)~×~t}}$

${\sf\bold{10t~=~25}}$

${\sf\bold{t~=~2.5~m/s}}$

$\large{\sf{.°.~Time~=~2.5~m/s}}$