Question

A bicycle, a motorcycle, a car, and a semi-trailer truck are moving at the same speed.

Which vehicle has the greatest kinetic energy?

Answer 1

Answer: Option (d) is the correct answer.

Step-by-step explanation:

As we know that kinetic energy is the energy obtained by an object. And, relation between kinetic energy and mass of an object is as follows.

Mathematically, K.E =
`(1)/(2)mv^(2)`

where, m = mass of an object

v = velocity of an object

Since, it is given that all the objects are travelling at a same speed and kinetic energy is directly proportional to mass of an object. Hence, more is the mass of object more will be its kinetic energy.

So, out of the given options a semi-trailer truck will have the highest mass. Hence, kinetic energy of semi-trailer truck will be the highest.

Thus, we can conclude that semi-trailer truck is the vehicle which has the greatest kinetic energy.

Answer 2

semi-trailer truck

Step-by-step explanation:

Kinetic energy

`E = (1)/(2)mv^2`

Kinetic energy is directly proportional to mass of the vehicle

Since all vehicles are moving at the same velocity, their kinetic energy will vary depending on their mass.

Among a bicycle, a motorcycle, a car, and a semi-trailer truck, the semi-trailer truck is the heaviest.

Hence, the semi-trailer truck will have greatest kinetic energy