PLEASE I HAVE A TEST AND THIS IS THE ONLY ONE I NEED HELP ON A 0.75 kg ball is rolled down a hill that has a height of 3.0 m. Determine the velocity of the ball at the bottom of the hill.

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Next a skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 15 with the horizontal. the rope moves parallel to the slope with a constant speed of 0.69 m/s. the force of the rope does 800 3 of work on the skier as the skier moves a distance of 8.4 m up the incline. (a) if the rope moved with a constant speed of 2.2 m/s how much work would the force of the rope do on the skier as the skler moved a distance of 8.4 m up the incline? at what rate is the force of the rope doing work on the skier when the rope moves with a speed of (b) 0.69 m/s and (c) 2.2 m/s?

Am i correct on these two physics questions?