A stone is dropped from rest in to a well it is observed to hit the water after 2seconds .Find the distance down the water surface. How are fast must the stone thrown downwards in order to hit the surface after only 1second?.what are are the impact velocities in the two cases g=10meter per second square.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?