question_answer

  (i) Explain why is it difficult to walk on sand? (ii) Why is the recoil of a heavy gun, on firing, not so strong as that of a light gun using the same cartridge? (iii) A constant force acts on an object of 5 kg for a period of 2 s. It increases the velocity of an object from 3 m/s to 7 m/s. Find the magnitude of the applied force. Now if the force was applied for a period of 5 s, what would be the final velocity of the object?

Answer: