At the bottom of its swing, a Pendulum has a kinetic energy of 6.9 J. What is the potential energy for the pendulum at the top of the swing?
Round your answer to the nearest whole number.

What is the mass of the same rock on the earth

What part of the ear is names after tools, such as the hammer and the anvil?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?