A sock stuck to the side of a clothes-dryer bar-
rel has a centripetal acceleration of 25 m/s2.
If the dryer barrel has a radius of 25 cm,
what is the tangential speed of the sock?
Answer in units of m/s.

please help
I am confused

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

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?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?