Alex rides on a bike that starts from rest and accelerates to a speed of 20 m/s in 8 seconds. What is Alex’s acceleration? with steps please

2.5m/s

Explanation:

a =

vf = final velocity = 20m/s

vi = initial velocity = 0m/s (alex is starting "at rest")

a = acceleration =

t = time = 8s

a = = 2.5m/s

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

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.