Q. Two balls of the same mass are accelerated by different net forces such that one ball gains a velocity twice that of the other ball in the process. Is the work done by the net force acting on the faster moving ball twice that done on the slower moving ball? explain.
Q. A 78.0 g block carrying a charge Q = 40.0 µC is connected to a spring for which k = 71.0 N/m. The block lies on a frictionless, horizontal surface and is immersed in a uniform electric field of magnitude E = 4.74 104 N/C directed. The block is released from rest when the spring is unstretched (x = 0). By what maximum distance does the block move from its initial position? Find the subsequent equilibrium position of the block and the amplitude of its motion. Using conservation of energy, find a symbolic relationship giving the potential difference between its initial position and the point of maximum extension in terms of the spring constant k, the amplitude A, and the charge Q.