Gerard is measuring the speed of a remote-controlled airplane. he measures that the airplane travels 110 m in 5.4 seconds, giving a speed of 20 m/s. what will gerard need to change, if he wants to get a more precise value for speed?

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.