A body starting from rest moves with uniform acceleration until it attains a speed of 100m/s after 20 s. It maintained this speed for the next 30s and came to rest by  uniformly deceleration in 30s. (a.) Find its acceleration.

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