Physics Help Forum How long it would take for an object to fall

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Mar 16th 2009, 02:50 PM #1 Junior Member   Join Date: Mar 2009 Location: Estonia Posts: 1 How long it would take for an object to fall Hello, Firstly like the title says, how long it would take for an 50kg object to fall from 100m. I'm talking about Earth. Secondly, would 100kg object fall faster than the 50kg one if they both had exactly the same cubic measure? Or it would take the same time for both of them?
 Mar 16th 2009, 03:33 PM #2 Senior Member     Join Date: Apr 2008 Posts: 815 Hi Miko, the time of fall is independent of the mass of the object falling. In other words the 50kg object and the 100 kg object would fall in the same amount of time. $\displaystyle a(t)=9.8$ $\displaystyle v(t)=9.8t$ $\displaystyle x(t)=\frac{9.8t^2}{2}+100$. Solve for t in the equation $\displaystyle x(t)=0$. This is the time any object would take to fall 100 m if they start to fall from 100 m above the ground and if they start with a speed of 0m/s. __________________ Isaac If the problem is too hard just let the Universe solve it.

 Tags fall, long, object