Question

A pinball bangs against a bumper, giving the ball a speed of 52 cm/s. If the ball has a mass of 50.0 g, what is the ball's kinetic energy in joules?

Answer 1

I found: `K=6.76xx10^-3J`

Explanation:

We need first to change into `m/s` and `kg` to get:
`52(cm)/s=52/100m/s=0.52m/s`
and:
`50g=50/1000kg=0.05kg`
Kinrtic Energy will be:
`K=1/2mv^2=1/2(0.05)(0.52)^2=6.76xx10^-3J`

Answer 2

`6.76xx10^(-3)j`

Explanation:

we know that,

`E_K=1/2mv^2`

here,
`m=50gm=0.05kg`
`v=52(cm)/s=0.52m/s`

so,
`E_K=1/2*0.05*(0.52)^2`
`=6.76xx10^(-3)j`