Pls A car weighing 3000kg brakes and stops for I min. The coefficient of friction of the car wheels with the road is 0.02. How fast did the car move at the moment of braking start?​​

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

Should we celebrate the voyages of zheng he mini q answer key