Question 15 Graph of position versus time with position on y axis from 0 to 80 miles and time on x axis from 0 to 5 hours. Segment 1 goes from 0, 0 to 1, 40. Segment 2 goes from 1, 40 to 2, 40. Segment 3 goes from 2, 40 to 3, 60. Segment 4 goes from 3, 60 to 4, 75. Segment 5 goes from 4, 75 to 5, 75.
In the Position versus Time graph of an object moving in a straight line, what is the average speed for the object during the second hour? (2 points)

a
Zero

b
20 mph

c
40 mph

d
80 mph

Where do magnetic lines of force enter earth?

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?