Jay kicks a soccer ball Upward at an angle of 45 with a velocity of 20 m/s landing 2.8 seconds later

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

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)