Question

the kinetic energy of object of mass m moving with a velocity of 5 ms-1
is 25 joules. what will be its kinetic energy when its velocity is doubled what will be its kinetic energy when its velocity is increased three times​

Answer 1

Kinetic energy= 1/2 m v^2

                   25= 1/2 m * 25

                   mass= 2 kg

CASE 1 : When Velocity is doubled    (v=10m/s)

            1/2 m v^2

            1/2*2*100

          Kinetic energy is 100 J

CASE 2: When velocity is tripled        (v=15 m/s)

            1/2 m v ^2

            1/2*2*225

          Kinetic energy is 225 J