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Question: please i need the answers for these three questions the...

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Please, I need the answers for these three questions:

The world record for swimming speed is held by César Cielo from Brazil. At the 2008 Beijing Olympic Games, he swam the 50 m freestyle in 21.30 seconds. What was his average speed in km per hour? In miles per hour (mph)? In feet per second (ft/s)?

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A 5.25 kg chair sits on the floor. Each leg of the chair has a circular foot with a radius of 2.40 cm. Assume the weight of the chair is equally distributed on the four feet. a.) Find the pressure in Pascals between the feet of the chair and the floor. b.) Suppose an adult weighing 62.5 kg sits on the chair. Again, assume the weight of the chair is equally distributed on the four feet. Find the new pressure in Pascals between the feet of the chair and the floor.

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At a strong man competition, Eddie Hall applied a force of 1200 N to push a car 100 ft. Determine the work done on the car (or energy required) in Joules.

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