help with physical science questions

A box rests at the bottom of a 30degree inclined plane. A constant force of 245N moves the box at constant speed 5m higher up the smooth plane. What is the weight of the box ?

Power is equal to work per unit time. You already know the work done - so simply divide by the time takesn to get power in terms of lb-ft/second.

Thato - please don't tag a new question onto an old thread, but rather you should post a new question.

The force applied to the box must counteract the weight of the box in order for it to move at constant velocity - meaning no acceleration so the sum of forces acting on the box =ma = 0. Can you tell us the component of the box's weight resisting movement in the direction of the inclined plane? This must equal the force being applied - then you can set up a equation and solve for 'm'.