1. A student dropped a ball from the top of a table. The ball's motion was recorded by a motion sensor above the ball. The following data were
recorded. What most likely happened after 0.5 s? (P.4A).
Time (s)
0
Distance (m)
0
.05
.1
2
.3
.20
.45
.80
.4
.5
.80

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?