Homework Help: Thermal Energy Question

[yamm14]

Homework Statement:

A 150g steel spoon (constant = 420J/kg degrees Celsius) initially at 19 degrees Celsius is placed into a 250mL cup of water at 89 degrees Celsius. When both objects reach the same temperature what temperature will that be?

Relevant Equations:

change in energy = (mass)(constant)(change in temperature)
water constant = 4200J (kg degrees Celsius)

I don't know what to do!

 

[willem2]

The spoon will cool down and lose energy, the water will warm up and gain energy. Use conservation of energy.

 

[hmmm27]

I don't know what to do!

Homework Help Guidelines
Pay some attention to #4 and read the section it references. Thankyou