2m+3=23
2m=20
m=10
let me know in the comments if you need further explanation :)
Answer:
Turn everything into fractions. You can also combine like terms.
Step-by-step explanation:
It is 75000J
I checked this by plugging in the values above to the kinetic energy formula (1/2mv^2)
It takes the son one and half hours to clean the house. To find this you need the equations F+S=2 and F+1=S. (F=father and S=son) You take the F+1 and substitute it in for S in F+S to get F+(F+1)=2. Then you combined like factors, 2F+1=2, and simplify to get F=.5hr. After this you plug .5 in to F+1=S to get (.5)+1=S, meaning it takes the son 1.5 hour to clean the house.
