Questions asked by BB

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• For first-row transition metals, why do the 4s orbitals fill up before the 3d orbitals? And why are electrons lost from 4s orbitals before 3d orbitals?
  
• A 3kg stone is dropped from a height of 4m. What is its momentum as it strikes the ground? Solve using suvat
  
• I am trying to push start a car which has stopped. If the biggest force with which I can push the car is 420N, and the car has a mass of 1025kg, how fast will it be going after 8.0s of pushing?