A car with a mass of 1 tonne during braking reduced its speed from 108 to 36 find the module for changing the kinetic energy of the car

univerkov | December 3, 2020 | education

The kinetic energy formula has the form: E = mV ^ 2/2.
The kinetic energy of the car until the speed decreases is:
E1 = 1000 * 900/2 = 450,000J
After braking:
E2 = 1000 * 100/2 = 50,000J
Modulus of change is:
E1 – E2 = 400000J or 400kJ

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