I need help with a physics calculation using laws of motion?

I have a 400kg stationary weight and i lift it to a height of 10m . Frictional resistance to motion is 300N and the velocity at 10m is 7m/s.



What is the inertia force, the total propelling force, work done and the maximum power req.



I also need to find out what the total work done is for the above system.I need help with a physics calculation using laws of motion?You need to add up all the different energies to find the work done.



The energy lost due to friction is F x d = 300 x 10



The potential energy is f x d = mg x d



The kinetic energy at the top is Ek=陆mv虏





The maximum power is when it is at the top because power = F x velocity and that is the maximum velocity.



"inertia force, the total propelling force" I'm not sure what these are, they are un-familiar terms.

However read the below link.



http://www.physicsforums.com/showthread.鈥?/a>



I suspect/believe the initial force is mg down.



propelling ? maybe just use the total.



f= mg + friction + ma鈧€



for a鈧€ use...



v虏 = v鈧€虏 + 2ad



v鈧€=0



This is assuming the force is constant.