A point charge is placed 3 m from a 4 pc charge. What is the strength of the electric field on the point charge at this distance? (Round to the nearest thousands.)

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)