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VMariaS [17]
3 years ago
10

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 en

ergy in joules
Physics
1 answer:
Ann [662]3 years ago
7 0

Explanation:

<h3><u>Given</u><u>:</u><u>-</u></h3>

mass=50g

velocity=42cm/s

<h3><u>To</u><u> </u><u>find</u><u>:</u><u>-</u></h3>

Kinetic energy

<h3><u>Solution</u><u>:</u><u>-</u></h3>

As we know that

{\boxed{\sf kinetic\:energy={\dfrac {1}{2}}mv^2}}

  • Substitute the values

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

{:}\longrightarrow\sf k.v=50\times 21^2

{:}\longrightarrow\sf k.v=50×441

{:}\longrightarrow\sf k.v=22050MJ

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

\therefore{\underline{\boxed{\bf Kinetic\:energy=22Joule}}}

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