lcrane1001
contestada

Helen is driving her car if the kinetic energy of the car is 8.10 E4 J and the mass of the car and its contents is 1010 kg Helen is driving at a speed of
1.26 m/s
9.01 m/s
12.0m/s
12.6m/s
81.1m/s

Respuesta :

davy94
( 8.10) x 10^4 J = ½(1010kg)V² 
......................= 505V² 
( 8.10) x 10^4 J =[(.0505) x 10^4] V² ........<==10^4 cancels 
8.10 = .0505 V² 
.........______ 
V = ²√ 160.4 

V= 12.6 m/s 

(that's 12.6m/sec(1km/1000m)(3600secs/1hr) = 45.36kph) 
 my diagram is wrong, it is just an ordinary car, 

Helen is driving her car if the kinetic energy of the car is 8.10 E4 J and the mass of the car and its contents is 1010 kg Helen is driving at a speed of 12.6m/s

What is Kinetic energy ?

Kinetic energy is the energy associated with the movement of objects. The kinetic energy of an object depends on both its mass and velocity, with its velocity playing a much greater role. Let a body of mass m moving with velocity v.

Kinetic energy =  1/2 * m * [tex]v^{2}[/tex]

its SI unit is Joule.

Kinetic energy = 1/2 * m * [tex]v^{2}[/tex]

( 8.10) * [tex]10^{4}[/tex] J = ½ * ( 1010) * [tex]v^{2}[/tex]  

  ( 8.10) * [tex]10^{4}[/tex] J = 505 [tex]v^{2}[/tex]  

( 8.10) *  [tex]10^{4}[/tex] J =[(.0505) x 10^4] * [tex]v^{2}[/tex]

8.10 = .0505* [tex]v^{2}[/tex]

V = ²√ 160.4

V= 12.6 m/s

correct option is d) 12.6m/s

To learn more about Kinetic energy

https://brainly.com/question/12669551?referrer=searchResults

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