A 55 slug hot air balloon takes off from rest at the surface of the earth. the nonconservative wind and nonconservative lift forces take the balloon upward, doing 85,000 ft-lb of work on the balloon in the process.
a) at which height above the surface of the earh does the balloon have a speed of 23 ft/sec?

b) if it takes 3.46 seconds for the nonconservative wind and nonconservative lift forces to perform 85,000 ft-lb of work, how much horsepoer is generated by these forces?

Im pretty sure i did part a right, but im not sure how to do part B.

A 5.25 kg block is sliding down an inclined plane. at one point during the block's motion, it is 1.4 meters above the bottom of the inclined plane. when the block reaches the bottom of the inclined plane, its speed is 8 m/s. the nonconservative forces do 84 Joules of work during this motion. What is the speed of the block when it is 1.4 meters above the bottom of the inclined plane? (speed is not zero at this point)

this one im not really sure how to do. so if anyone here knows physics, id love to have some help here