Question

in a bit escape from your alien captors a hurl your paperweight straight up towards the door switch on a spaceship above you if the switch is 25m above you how fast so paperweight needs to leave your hand

Answer 1

Height to be reached above is given as

H = 25 m

let say initial speed is "v"

the final speed that will reach must be ZERO

now we will use kinematics

$v_f^2 - v_i^2 = 2 a d$

here we know that

$v_f = 0$

$v_i = ?$

$a = -9.81 m/s^2$

$d = 25 m$

now from above equation we will have

$0 - v^2 = 2(-9.81)(25)$

$v^2 = 490.5 m^2/s^2$

$v = 22.15 m/s$

so the speed must be 22.15 m/s