## rvc one year ago A box is released from a plane moving horiontally with constant velocity "u" from a certain height "h" from the ground takes 5 seconds to reach the ground hitting it at an angle of 75 Determine a) horizontal distance "x" b) the height "h" c) the velocity "u"

1. rvc

|dw:1439693206815:dw|

2. rvc

3. rvc

@jacalneaila

4. Michele_Laino

If we see the box from an inertial system on the earth, we see that box which is moving along a vertical straight line, and its motion is an accelerated motion due to gravity. So we can write this: $\Large h = \frac{1}{2}g{t^2} = ...?$ Furthermore, we have: $\Large h = x\tan 75 \Rightarrow x = \frac{h}{{\tan 75}}$ Finally, for the horizontal motion of the box, we can write: $\Large x = ut \Rightarrow u = \frac{x}{t}$ |dw:1439704782838:dw|

5. rvc

thank you so much @Michele_Laino

6. Michele_Laino

:)