The horizontal coordinates of a Frisbee in a strong wind are given by x=−12t + 4 t * t (x equals minus 12 t plus 4 t squared) and y=10 t − 3t * t, where x and y are in meters, and t is in seconds. What is the magnitude of the instantaneous velocity at t = 2 s, accurate to the nearest m/s?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final