What happens to the velocity of a sound wave in air if the temperature of the air increases?
a
velocity increases
b. velocity does not change
dc. velocity decreases
od. velocity drops to zero

A.velocity increased

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.

gravity

explanation: