Aball is thrown straight up at time t=0 with an initial speed of 19m/s. take the point of release to be y0=0 and upwards to be the positive direction. calculate the displacement at the time of 0.50 s

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.