Question

A LORRY OF MASS 4000 KG IS TRAVELLING AT SPEED OF 4.0 M\S . A CAR HAS A MASS OF 1000 KG . THE KINETIC ENERGY OF THE CAR IS EQUAL TO THE KINETIC ENERGY OF THE LORRY. WHAT IS THE SPEED OF THE CAR.

Answer 1

kinetic energy is the energy present in moving object

according to given question kinetic energy of Lory =the kinetic energy of car

therefor speed of car=4.0m/s

Answer 2

The speed of the car is 8 m/s.

Explanation:

It is given that,

Mass of the Lorry, m = 4000 kg

Speed of the Lorry, v = 4 m/s

Mass of the car, m' = 1000 kg

It is mentioned that the kinetic energy of the car is equal to the kinetic energy of the lorry. Let v' is the speed of the car.

$K_L=K__C$

$(1/2)mv^2=(1/2)m'v'^2$

$mv^2=m'v'^2$

$4000\times (4)^2=1000v'^2$

v' = 8 m/s

So, the speed of the car is 8 m/s. Hence, this is the required solution.

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Kinetic energy

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