A) a 70 kg runner begins his slide into third base moving at a speed of 4 m/s. How much work does friction do to slow him down as he slides into third base? B) If the runner slides for 2 m, what is the force of friction between the player and the ground?

Calculate the kinetic energy of earth due to its spinning about its axis. krot = j compare your answer with the kinetic energy of the orbital motion of earth's center of mass about the sun. assume earth to be a homogeneous sphere of mass 6.00 1024 kg and radius 6.40 106 m. the radius of earth's orbit is 1.50 1011 m.

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road