Acoiled spring, a bow when the string is pulled back, a tennis ball when it hits the ground, a stretched elastic band, a diver when she falls into the water which of the objects have only kinetic energy

Which option describes the most cost-effective way for a skateboard company to purchase plywood? a.a pallet of 100 sheets for $1,000 b.a pallet of 200 sheets for $1,800 c.a pallet of 500 sheets for $3,500 d.a pallet of 1,000 sheets for $8,000