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

Question

asked May 25, 2021 113k views

1 Answer

Daud · Answer 1 · 2021-06-01T04:36:16+0000

Step-by-step explanation:

mass=50g

velocity=42cm/s

Kinetic energy

As we know that

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

${:}\longrightarrow$
$\sf k.v={\frac {1}{{\cancel{2}}}}* 50* {\cancel{42}}^2$

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

${:}\longrightarrow$
$\sf k.v=50×441$

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

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