The distance between your school and house is 80 m. In going to your school starting from your house you walk for 2 minutes in a straight line. After 3 hours, you take 4 minutes to go back
home in a straight line. (a) What is your average speed in going to your school starting from
your house? (b) What is your average speed during your entire trip? (c) What is your average
velocity during your entire trip?​

a) 2/3 m/s

b) 0.0143 m/s

c) 0.00 m/s

Explanation:

a) 80 m / (2(60) s = 2/3 m/s

b) 2(80) / (3(3600) + (2 + 4)(60)) = 160 / 11,160 = 0.0143 m/s

c) start and end at your house. no displacement, no velocity.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

it would be c. predictability