Question

Two bodies which are mass, move with uniform velocities of 6 m s‐1 and 18 m s‐1, respectively. Find the ratio of their kinetic energies.​

Answer 1

Explanation:

Given velocity of first body v

1

=v

And velocity of second body, v

2

=2v

KE=

2

mv

2

Since masses are same, kinetic energy is directly proportional to the square of the velocity (KE α v

2

)

Hence, ratio of their kinetic energies is:

KE

2

KE

1

=

v

2

2

v

1

2

=

(2v)

2

v

2

=

4v

2

v

2

=

4

1

=1:4