If a 42kg rolling object slows from 11.5m/s to 3.33m/s how much work did friction do

1608.39 J

Explanation: Given that the

mass M = 42kg

U = 11.5m/s

V = 3.33m/s

how much work did friction do

Work done = Force × distance

Work done = Ma × distance

But acceleration a = V/t

Work done = M × V/t × d

Work done = M × V × d/t

Where d/t = velocity

Therefore,

Work done = M × U × V

Work done = 42 × 11.5 × 3.33

Work done = 1608.39 J

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

because growing process had stoped after 4-5 year