College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 93

During liftoff, a hot-air balloon accelerates upward at a rate of 3.0 m/s 2. The balloonist drops an object over the side of the gondola when the speed is 15 m/s. (a) What is the object's acceleration after it is released (relative to the ground) (b) How long does it take to hit the ground