Given that the square of the velocity of a particle in terms of the generalized coordinates 91 --z, q2 --ф s obtain the generalized covariant components of the velocity and the acceleration of the particle.

Why is there friction between objects

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

Describe uniform velocity and variable velocity in short