A truck starts from rest and rolls down a hill with a constantacceleration. It travels a distance of 400 m in 20 s. Find itsacceleration. Find the force acting on it if its mass is7 tonnes (Hint: 1 tonne = 1000 kg.)

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)