The drawing shows a device that you can make with a piece of cardboard, which can be used to measure a person's reaction time. hold the card at the top and suddenly drop it. ask a friend to try to catch the card between his or her thumb and index finger. initially, your friend's fingers must be level with the asterisks at the bottom. by noting where your friend catches the card, you can determine his or her reaction time in milliseconds (ms). calculate the distances (a) d1, (b) d2, and (c) d3.

a displacement distance is size of displ

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.

earth's neighboring galaxy, the andromeda galaxy, is a distance of 2.54×107 light-years from earth. if the lifetime of a human is taken to be 70.0 years, a spaceship would need to achieve some minimum speed min to deliver a living human being to this galaxy.