The following data was collected from another student's three attempts at
walking with a constant velocity. calculate the student's average speed across
all three trials
trial 1 - position (m)
trial 2 - position (m)
trial 3 - position (m)
0.0
o
o
0.3
0.33
0.36
1.62
0.8
1.2
2.51
1.58
2.38
3.17
4.12
4.88
5.79
0.37
1.67
2.42
3.24
4.27
4.96
6.13
21
2.5
3.35
4.41
5.12
6.24
3.0

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults