A brick of mass 5 kg is released from rest at a height of 3 m. How fast is it going when it hits the ground? Acceleration due to gravity is g = 9.8 m/s2.

A. 9.9 m/s

B. 8.1 m/s

C. 7.2 m/s

D. 7.7 m/s

A wave of sound proceeds through the auditory canal to the inner ear where receptor neurons on the basilar membrane are stimulated. The neurons send a message to the brain.

A ball is dropped and bounces off the floor. Its speed is the same immediately before and immediately after the collision. Which of the following is true about the collision between the ball and the floor? a) The ball's momentum is conserved.

Which of these toy trains has the slowest speed? A) Toy train 2 travels 100 cm in 10 seconds. B) Toy train 3 travels 100 cm in 20 seconds. C) Toy train 4 travels 200 cm in 10 seconds. D) Toy train 1 travels 200 cm in 20 seconds.

What is the requirement for a core to be used in an electromagnet? A. It must be able to be increased. B. It cannot be magnetized. C. It must be an ion. D. It must be able to be magnetized.

Which of Newton's laws accounts for the following statement? Negative acceleration is proportional to applied braking force

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?