A train travelled from city A to city B . for the first 14 hours it travelled at an average speed of 120 km/h . for the next 10 hours it travelled at an average speed of 90 km/h was the average speed of the whole journey km/h ?

Ain is , is 's of ? 0.62 0.79 1.27 1.50

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.