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

Answer:

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

Answer:

#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#