An old 3000-lb gun fires an 18-lb shell with an initial velocity of V0=1500ft/s at an angle of 30 degrees. The gun rest on a horizontal surface and is free to move horizontally. Assuming that the varrel of the gun is rigidly attached to the frame and that the shell leaves the barrel 5-msec after firing, determine
1) The recoil velocity of the gun
2) The normal force exerted by the ground by the gun