What is your useing it phone in the night say 2:00amthat when you wake up and put down it phone after using it for a while u say it's about 2:30 in your head and when you look at the time it shocked because the time says 4:00am. how much time did you take to put down your phone ​

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.