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a racing car has a mass of 1910 kg. the acceleration of gravity is 9.8 m/s 2 . what is its kinetic energy if it has a speed of 109 km/h? answer in units of j

Respuesta :

Answer:

28,915 J

Explanation:

KE = 1/2mv²

g (9.8 m/s²) is not relevant to solving this problem

convert v from km/hr to m/s:

109 km/hr = 30.3 m/s  (109 km/hr x 1000 m/km ÷ 3600 s/hr)

Now solve for KE:

KE =  1/2(1910 kg)(30.3 m/s) = 28,915 J

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