Which expression can be used to calculate centripetal acceleration?

B)

Explanation:

As we know that for uniform circular motion the speed of the object is given by

here we know that

now we know the formula of centripetal acceleration as

here we know that

by solving above we have

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.

0.11 m/s and 0.28 m/s should be correct