Question

a car is moving with a speed of 15 km per hour and other identical car is moving with speed 30 km per hour compare their kinetic energy​

Answer 1

Two identical cars mean, they have equal mass

K.E = 1/2 mv 2

Let m be the mass of each car

Kinetic energy of car A=1/2M x (15)2

=225/2

=112.5 M J

Kinetic energy of car B = 1/2 M (30)2

= 450 M J

Kinetic energy of car A/Kinetic energy of car B =112.5/450

=1/4

=1:4

K.E. of car B is 4 times K.E. of car A.