It takes a plane 1.5 h to travel between city A and city B. How far apart are the
two cities if the cruising speed of the plane is 800 km/h? A) 500 km B) 600 km C) 1,000 km D) 1,200 km

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.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

power out to power in less than 100%

ingenuity says that the answer is 2.7 m.