A Pile Driver Drives a Post into the Ground

question 81

Multiple Choice

A pile driver drives a post into the ground.The mass of the pile driver is 2 500 kg and it is dropped through a height of 8.0 m on each stroke.If the resisting force of the ground is 4.0 ´ 10⁶ N,how far is the post driven in on each stroke?

• A)4.9 cm
• B)9.8 cm
• C)16 cm
• D)49 cm

---

Definitions:

Water

A transparent, odorless, tasteless liquid compound of hydrogen and oxygen, vital for all known forms of life and used in many industrial processes.

Solutes

Substances dissolved in a solvent, forming a solution; solutes can be solid, liquid, or gas.

Kidney

A pair of organs in vertebrates that filter blood to remove waste products and excess substances, producing urine.

Blood

A vital liquid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away.