A car travels along a straight road at a constant 72 km/h. Determine the car's distance after 5 minutes.

6 km

Explanation:

Let's first reduce the time travelled from minutes to hours since the speed of the car is given in km/h:

5 minutes = 5 / 60  h = 1/12 h

Now use this value in the formula for distant in uniform motion:

Distance = speed * time

Distance = 72 km/h * 1/12 h = 6 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.

object 2 because all the other ones are wrong