In which of the following cases does a car have a negative velocity and a positive acceleration? A car that is traveling in the: a. +x direction decreasing in speed.
b. +x direction increasing in speed.
c. −x direction decreasing in speed.
d. −x direction increasing in speed.
e. −x direction at a constant 20 m/s.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.