Question

The masses of scooter and bike are in the ratio 2:3 but moving with same speed of 108 km/hr. Compute the ratio of their kinetic energy.

Answer 1

2:3 since their speed is same

Answer 2

Mass of scooter =2x

Mass of bike =3x

V1=V2=108 km/h

As K.E.=1/2mv^2

So K.E. of scooter=1/2*2x*108*108

And K.E. of bike=1/2*3x*108*108

K.E. of scooter=11664x

K.E. of bike=17496x

Ratio of bike to that of scooter=17496x/11664x

3/2

So their ratios are 3:2