You _____ obey your teacher​

You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram

Fill in the blank with suitable word ...... am your teacher, will teach you.

You are on the roof of your school building 60m, high. You see your physics teacher 1.6 m tall walking directly towards the building at 2.m/s. You wish to throw an egg vertically down at a speed 5m/s on to your teacher's head. Where should your teacher be when you throw the egg. Neglect air resistance. Take g = 10m//s^(2)