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andriy [413]
3 years ago
5

if a car has a kinetic energy of 400 J at 20m/s what.is the cars kinetic energy in kJ at a speed of 5 m/s

Biology
1 answer:
Paladinen [302]3 years ago
4 0

Kinetic energy is an expression of the fact that a moving object can do work on anything it hits; it quantifies the amount of work the object could do as a result of its motion. It can be calculated as:

 

KE = mv^2 /2

 

We calculate the problem as follows:

 

KE = mv^2 /2

400 = m(20)^2 / 2

m = 2 kg

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