1.)An object moves along a straight line. First it travels at a velocity of 12m/s for 5s and then continues at the same direction with 20m/s for 3s. What is its average speed? 2.)A car travels along the x-axis for 4s at an average velocity 10m/s and 2s with an average velocity 30m/s and finally 4s with an average velocity 25m/s. What is its average velocity across the whole path?

The slope of a velocity time graph over any interval of time gives the during that interval

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?

You throw a baseball directly upward at time =0 at an initial speed of 14.9 m/s. what is the maximum height the ball reaches above where it leaves your hand? ignore air resistance and take =9.80 m/s2.