Question

A car and a truck have same speed of 30m/s if their masses are in ratio 1;3 find the ratio of the kinetic energy

Answer 1

let the unknown quantity be x
car=1x
truck=3x
velocity=30m/s
for car kinetic energy
k= 1/2 mv^2
k=x.15.30
k=450x
for truck velocity
k=1/2mv^2
k=3x.15.30
k=1350x
ratio of k=450x/1350x=9/27=1/3
so the ratio is 1:3

Answer 2

Answer:

above is ur answer