Question

a 900 kg compact car is moving at a certain speed. if it's kinetic energy is 3,20,000 j, find the velocity at which the car is travelling ​

Answer 1

Answer:

Kinetic Energy = Mass × (Velocity)^2 / 2

320000 = 900 × (Velocity)^2 / 2

320000 × 2 = 900 × (Velocity)^2

640000 = 900 × (Velocity)^2

(Velocity)^2 = 640000 / 900

(Velocity)^2 = 6400 / 9

(Velocity) = root 6400 / root 9

Velocity = 80 / 3 m/s

Answer 2

Answer:

Weight = 900kg

Kinetic Energy = 320000J

Velocity = ?

K.E. = 1/2 mv²

=> 320000J = 1/2 × 900kg × v²

=> 1/2 × 900kg × v² = 320000J

=> v² = 320000×2/900

=> v² = 6400/9

=> v = √6400/9

=> v = 80/3 m/s (Ans)

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