49. A sphere of mass 3 kg attached to a thin string is released 'om the position shoun aboye. sit its lowest point the sphere strikes a block of mass 1 kg that is initially at rest. Using measurements of the objects" speeds taken by two motion detectors iim'nediately before and after the collision= a student calculates that the total kinetic energy of the sphere-block system after the collision is signicantly less than it was before the collision. Which of the follouing most plausibly explains this result? {A} The student made a mistake in obtaining data= because in a collision the kinetic energy must be conserved. (Bl In calculating kinetic energy after the collision, the student did not account for the energy lost when the block ' slid on the table. In calculating kinetic energy, the student did not consider the potential energy of the sphere-Earth system as 03" the sphere was released. The sphere or the block was deformed during the collision and dissipated part of the sphere-block system's (Db ' mechanical energy