A 0.1-kilogram ball rolls across the floor at a speed of 2 meters per second. Another 0.1-kilogram ball rests on a shelf 1 meter above the floor. Which ball has more energy?

Question

anonymous · Answer

i think the one above the ground, just cant remember the free-fall formula, it had gravity in it , distance and mass

anonymous · Answer

kinetic energy is given by $E_k=\frac{1}{2}mv^2$ (use this to calculate for the rolling ball)
while gravitational potential energy is given by $E_g=mgh$(use this to calculate for the ball at rest)

and btw, welcome to open study;)

anonymous · Answer

thanks @Chibi_Robo3 
in the first instance the energy will be 0.2 and in the second 1 ?

anonymous · Answer

if we take g=10m/s2

anonymous · Answer

yeah:)

and also don't forget the units

anonymous · Answer

excellent, how do you still remember these formulas , genius!

anonymous · Answer

oh wait, for the first one it's $v^2$ so it will not be 0.2 J

anonymous · Answer

i'm taking physics 12 right now

anonymous · Answer

ohh, i took it 30 years ago ;)

anonymous · Answer

old fart now

anonymous · Answer

ooh i see