Question 12 An astronaut of mass 66 kg weighs 66*10 N on Earth's surface. His weight on the surface of Mars, where the acceleration due to gravity is 3.71 m/s2, would be about Question 13 1 pts You stand on your skateboard and exert a 63 N push on the wall next to you. If your mass is 80 kg you'll momentarily accelerate from the wall at about ~ | Question 19 1 pts The airspeed of an airplane is 162 km/h. When it is caught in a 228 km/h crosswind, its speed across the ground below is ~ | Question 20 Ariver 155 m wide flows due south. A boat that goes 3 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in [ > | Question 9 1 pts Two people, one twice as massive as the other, attempt a tug-of-war with 6 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of