Abox with a frontal area of 2.5 ft2 and with a drag coefficient of cd =0.9 is fastened on the roof of your car. what is the aerodynamic drag force in pounds due to the box alone at a velocity of 88 ft/sec?

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?