A man uses a 320 kg hammer moving at 5 m/s to smash a 3 kg block of lead against a 450 kg rock. When he measured the temperature of the lead block, he found that it has increased by 5 degrees Celsius. How did this happen?
a) The friction between the lead block and the hammer generated heat
b) The impact caused a transfer of kinetic energy, resulting in heat
c) Chemical reactions between the lead block and the rock produced heat
d) The air resistance against the lead block caused a rise in temperature