Please answer the question in the screenshot >~< i need it done

Iflow from a warmer object to a cooler object until both objects are the same temperature what am i?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n