Question

a car has a kinetic energy of 432,000j when traveling at 32 meters a second, what's the cars mass?

Answer 1

Answer:843.75kg

Explanation:

kinetic energy(ke)=432000j

Velocity(v)=32m/s

Mass(m)=?

Ke=(mxv^2)/2

432000=(mx32^2)/2

432000=(mx32x32)/2

Cross multiplying we get

432000x2=(mx1024)

864000=1024m

Divide both sides by 1024

864000/1024=1024m/1024

843.75=m

m=843.75kg