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1 a Ball A, moving towards the right, collides with stationary ball B. Ball A bounces back; ball B moves off slowly to the right.

  • 1 a Ball A, moving towards the right, collides with stationary ball B. Ball A bounces back; ball B moves off slowly to the right. Which has the greater mass, ball A or ball B? b Trolley A, moving towards the right, collides with stationary trolley B. They stick together, and move off at less than half A’s original speed. Which has the greater mass, trolley A or trolley B?

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