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?

2 Answers
Feb 3, 2016

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

Feb 3, 2016

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