The average kinetic energy of the particles is higher in the hot tea, so it also has greater thermal energy then the cold tea.
I think it’s 8 hours. I’m sorry if I’m wrong.
I just did 400 divided by 50
The rate of acceleration of the crate would be 1 m/s^2 because the equation for force is F=ma and when you plug in your numbers you get 10=10a so a=1