question_answer 45)

  Velocity versus time graph of a ball of   mass 50 g rolling on a concrete floor is shown   in   figure. Calculate the acceleration and frictional force of the   floor on the ball.                         

Answer:

  Given, mass,                    Initial velocity, Final velocity, Time taken, From first equation of motion v = u + at  Acceleration,  [Negative sign shows retardation] Now, frictional force of the floor on the ball  [Negative sign showns against the direction of motion]