A body dropped from a height $h$ with an initial speed zero, strikes the ground with a velocity$3\,km/h$. Another body of same mass is dropped from the same height $h$ with an initial speed of $4\,km/h$ . Find the final velocity of second body with which it strikes the ground.........$km/h$
A body dropped from a height $h$ with an initial speed zero, strikes the ground with a velocity$3\,km/h$. Another body of same mass is dropped from the same height $h$ with an initial speed of $4\,km/h$ . Find the final velocity of second body with which it strikes the ground.........$km/h$
$3$
$4$
$5$
$12$
A body dropped from a height $h$ with an initial speed zero, strikes the ground with a velocity$3\,km/h$. Another body of same mass is dropped from the same height $h$ with an initial speed of $4\,km/h$ . Find the final velocity of second body with which it strikes the ground.........$km/h$
For first case ${v^2} - {0^2} = 2gh$ $⇒$ ${(3)^2} = 2gh$
For second case ${v^2} = {( - u)^2} + 2gh$ $ = {4^2} + {3^2}$
$\therefore $$v = 5\,km/h$
Other Language