Hello, i just wanted to ask someone to correct my work and to check if everything is correct. you!

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?

M1 = 2.8 kg, m2 = 6.72 kg, m3 = 11.2 kg, byas in .is ,is .toof m3 it 0.91 m. (in m/s)