4. The World Solar Challenge in 1987 was the first car race in which all the vehicles were solar powered. The winner was the GM Sunraycer, which had a mass of 177.4 kg, not counting the driver's mass. Assume that the driver had a mass of 61.5 kg, so that the total momentum of the car and driver had a magnitude of 4.416 x 10' kg. m/s. What was the car's speed in m/s and km/h? 5. The current holder of the men's world record for running 200 m is Michael Johnson, who in 1996 ran 200.0 m in 19.32 s. Johnson's mass at the time of his record-breaking run was about 77 kg. What was the magnitude of his momentum at his average speed? kg (m/s) m/s km/h