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A 8.50 g bullet has a speed of 1.50 km/s . What is the kinetic energy of the bullet? Express your answer to three significant figures and include the appropriate units.

Respuesta :

steinmetzspence
kinetic energy is equivalent to .5*(mass)*(velocity)^2 
The mass should be in kilo grams and the velocity in meters per second.
Let me know if you need more help with it. 
Cricetus

The kinetic energy will be "9562.5 J".

Given:

Mass,

  • m = 8.50 g

or,

            = [tex]8.50\times \frac{1 \ kg}{1000 \ gm}[/tex]

            = [tex]0.00850 \ kg[/tex]

Speed,

  • v = 1.50 km/s

or,

          = [tex]1.50\times \frac{1000 \ m}{1 \ km}[/tex]

          = [tex]1500 \ m/s[/tex]

As we know,

→ [tex]K.E = \frac{1}{2}\times mass\times (velocity)^2[/tex]

           [tex]= \frac{1}{2}\times 0.00850\times (1500)^2[/tex]

           [tex]= \frac{1}{2}\times 0.00850\times 2250000[/tex]

           [tex]= \frac{19125}{2}[/tex]

           [tex]= 9562.5[/tex] J

Thus the above answer is right.

           

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