9th Class Science Sample Paper Sample Paper - 5 Term - 1

  • question_answer
      A girl of mass 40 kg jumps with a horizontal velocity of onto a stationary cart with friction less wheels. The mass of the cart is 3 kg. What is her velocity as the cart starts moving? Assume that there is no external unbalanced force working in the horizontal direction?


      Here, mass of the girl, Mass of cart, Horizontal velocity of girl when the cart is stationary  Initial momentum of system                                                                                                                                                                                      (1) Let the final velocity of girl when the cart also starts moving with= v  Final momentum of the system    (1) As there is no horizontal unbalanced force on the system. Total final momentum = Total initial momentum                                                                                                                                                                          (1)

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