you throw a stone 6m/s from a third story window. if the windo is 12 meters above the ground?

Question

1. how long is it in flight
2. the speed of the stone just before it hits the ground.

Answer 1

Well. For the lenght of the flight, we know that it goes at 6 meters a second. So if it goes 12 meters.
Then it sill be 12/6 which is 2 seconds.

I hope that this helps

Answer 2

2. FInal Velocity

Since there is acc. due to gravitation (g),

v^2 - u^2 = 2as
=> v*v - 6*6 = 2*g*12
=> v*v - 36 = 2 * 9.8 * 12
=> v = sqrt(271.2)
=> v = 16.47 m/s

1. Time of Flight
v = u + at
=> 16.47 = 6 + g*t
=> t = (16.47-6)/g
=> t = 10.47/9.8
=> t = 1.068 sec

1. how long is it in flight = 1.06 sec
2. the speed of the stone just before it hits the ground. = 16.47 m/s

Hope this helps!

Answer 3

Direction of initial velocity is not given.

If it is horizontal, then vertical velocity is zero. So using
s = (4.9)t^2
12 = (4.9)t^2 gives t = 1.56 s
Speed of stone when it hits the ground is
v = 9.8t = (9.8) (1.56) = 15.3 m/s.

If the stone is thrown with a vertically downward velocity 6 m/s, then
12 = 6t + (4.9)t^2 which gives on solving t = 1.07 s
and v = 6 + (9.8)t = 6 + (9.8)(1.07) = 16.5 m/s.

Answer 4

Not enough information. What is the direction of the velocity vector? Are you throwing vertically, horizontally, or what?