A ball weighing 0.01 kg.hits a hard surface verticallywith a speed of 5 m/s andrebounds with the samespeed. The ball remains incontact with the surface for0.01 second. The averageforce exerted by the surfaceon the ball is

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A ball weighing 0.01 kg.hits a hard surface verticallywith a speed of 5 m/s andrebounds with the samespeed. The ball remains incontact with the surface for0.01 second. The averageforce exerted by the surfaceon the ball is