Một vật chuyển động thẳng đều, lúc t1=2s vật đến A có tọa độ x1=6m lúc t2 =5s vật đến B có tọa độ x2=12m. viết phương trình tọa độ của vật

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.