Adriver increases his velocity from 20 km/hr to 100 km/hr. by what factor does he increase the kinetic energy of the car with this increase in speed? kinetic energy is 4 times greater
kinetic energy is 16 times greater
kinetic energy is 25 times greater
kinetic energy is 9 times greater
kinetic energy is 2 times greater

25 times greater

Explanation:

Let the mass of the car is m

Initial speed, u = 20 km/h = 5.56 m/s

Final speed, v = 100 km/h = 27.78 m/s

The formula for the kinetic energy is given by

So, initial kinetic energy

Ki = 15.466 m

final kinetic energy

Kf = 385.86 m

Increase in kinetic energy is given by

=

= 385.86 / 15.466 = 25

So, the kinetic energy is 25 times greater.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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