contestada

A pinball bangs against a bumper giving the ball a speed of 42cm/s if the ball has a mass of 50.0g what is the ball’s kinetic energy in joules

Respuesta :

Explanation:

Given:-

mass=50g

velocity=42cm/s

To find:-

Kinetic energy

Solution:-

As we know that

[tex]{\boxed{\sf kinetic\:energy={\dfrac {1}{2}}mv^2}}[/tex]

  • Substitute the values

[tex]{:}\longrightarrow[/tex][tex]\sf k.v={\dfrac {1}{{\cancel{2}}}}\times 50\times {\cancel{42}}^2 [/tex]

[tex]{:}\longrightarrow[/tex][tex]\sf k.v=50\times 21^2 [/tex]

[tex]{:}\longrightarrow[/tex][tex]\sf k.v=50×441 [/tex]

[tex]{:}\longrightarrow[/tex][tex]\sf k.v=22050MJ [/tex]

  • 1Joule=1000milijoules
  • 22050MJ=[tex]{\dfrac {22050}{1000}}=22.05J[/tex]
  • =22J(Approximately)

[tex]\therefore[/tex][tex]{\underline{\boxed{\bf Kinetic\:energy=22Joule}}}[/tex]