Metal plates of mass 0.1 kg are fired into an iron plate of large mass, m, and specific heat capacity, c, at a temperature of 15 degrees. 25% of the kinetic energy of the pellets is converted to therm

Metal plates of mass 0.1 kg are fired into an iron plate of large mass, m, and specific heat capacity, c, at a temperature of 15 degrees. 25% of the kinetic energy of the pellets is converted to thermal energy and the plate temperature rises to 16 degrees. Find the average speed of the pellets before they hit the plate.