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Sonja [21]
3 years ago
7

A car moving with a velocity of 20 meters/second has

Physics
2 answers:
jolli1 [7]3 years ago
5 0
Kinetic energy is the product of mass and the square of the velocity of the moving object. In this case, we substitute the given data, that is 1.8 x10^5 joules = m * (20 m/s2)^2. Extracting the mass, the mass of the car therefore is equal to 450 kg
kramer3 years ago
4 0

Explanation :

Given that,

Velocity of the car, v = 20 m/s

Kinetic energy of the car, E_k=1.8\times 10^5\ J

Kinetic energy is given by :

E_k=\dfrac{1}{2}mv^2

m=\dfrac{2E_k}{v^2}

So, m=\dfrac{2\times 1.8\times 10^5\ J }{(20\ m/s)^2}

m = 900 kg

Hence, the mass of the car is 900 kg

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