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  1. M

    physics question- as level?

    The stunt person has a mass of 85kg. the speed of the person when reaching the ground is 20ms-1. The height of his starting position is 30m and the length of the cable he goes down is 50m. Calculate: A) the change in gravitational potential energy of the person B) the final kinetic energy of...
  2. M

    As Physics Questions- Forces and kinetic energy?

    The speed of a dart of mass 120g is reduced from 180ms-1 to 100ms-1 when it passes through a book of thickness 3.0cm. Calculate: A) the loss of kinetic energy of the dart B) the average frictional force exerted by the book on the dart any help on either question would be very much appreciated
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