question_answer

  An object covers a distance S1, with a constant speed v1 and then covers a further distance s2 with a constant speed v2. Find an expression for his average speed.

Answer:

  Here total distance covered by the moving object Now time taken by the object to cover a distance, with a constant speed,                                                                                                                                                                                                   (1) and time taken by the object to cover a distance, with a constant speed,                                                                                                                                                                                                  (1)  Total time taken,                                                                                                                                                                                              (1) Average speed,                                                                                                                                                                                          (1)