Estrella is overwhelmed with fear whenever she must leave the house. She is especially afraid when she uses the subway or goes grocery shopping. She rarely goes out of her own home unless someone she trusts accompanies her. Estrella's case illustrates:

An experiment was performed on a 2-kg block. forces of 5, 10 and 15 newtons respectively were applied to the block for 5 seconds. describe the difference in acceleration between the three trials. a) the final accelerations will all be the same. b) the final acceleration will triple between the first and third trial. c) the final acceleration will be cut by 1/3 from the first to third trial. d) the final acceleration will increase nine time between the first and third trial.