Hello i need help on my homework I completed all of the asnwers exept these two can someone please help me understand it, It will be greatly appreciated

Question

anonymous · Answer

What is the speed of a 48-kilogram dog running across a lawn with 216 joules of kinetic energy?

anonymous · Answer

A 0.1-kilogram ball rolls across the floor at a speed of 2 meters per second. Another 0.1-kilogram ball rests ona shelf 1 meter above the floor. Which ball has more energy? How much energy does it have? Include units with your answer