A cannon is set at an angle of 35 to the horizontal and has a spring constant of 2530n/m. How far would the spring need to be extended if a 2.50kg duck is fired from the canon and lands 733.8m away

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)