A car and a truck are moving at the same velocity of $60 k m h^{- 1}$ Which one has more kinetic energy ? (Mass of truck $>$ Mass of the car)

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Solution

Step 1: Given data
Velocity is the same, hence $v$ is constant and the mass of the truck $>$ mass of the car
Step 2: Formula for Kinetic energy
Kinetic energy, $K . E = \frac{1}{2} m v^{2}$
From the above, it is clear that Kinetic energy is directly proportional to the mass and the velocity.
Since the mass of the truck is $>$ the mass of the car, the kinetic energy of the truck will also be greater than the car.
Hence, the kinetic energy of the truck $>$ kinetic energy of the car.

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