Acceleration

What is the acceleration due to gravity or the gain in speed per second for a freely falling object?

• 5 m/s

• 5 m/s each second

• 10 m/s

• 10 m/s each second

What is the velocity of a falling rock 5 seconds after it is dropped from rest?

• 10 m/s

• 30 m/s

• 50 m/s

• 70 m/s

What is the velocity of a falling rock 5.5 seconds after it is dropped from rest?

• 10 m/s

• 45 m/s

• 50 m/s

• 55 m/s

A ball is thrown upward. Describe the velocity of the ball in the upward portion of the path.

• velocity is zero

• velocity is increasing

• velocity is decreasing

• I do not have enough information to describe the velocity of the ball.

A ball is thrown upward. Describe the velocity of the ball in the downward portion of the path.

• velocity is zero

• velocity is increasing

• velocity is decreasing

• I do not have enough information to describe the velocity of the ball.

A ball is thrown upward. Describe the velocity of the ball at the highest point in the path.

• velocity is zero

• velocity is increasing

• velocity is decreasing

• I do not have enough information to describe the velocity of the ball.

A cat steps off a ledge and drops to the ground, landing on its feet 1/2 second later. What is its speed on striking the ground?

• 0 m/s

• 1 m/s

• 5 m/s

• 10 m/s

A cat steps off a ledge and drops to the ground, landing on its feet 1 second later. What is its speed on striking the ground?

• 0 m/s

• 1 m/s

• 5 m/s

• 10 m/s

A cat steps off a ledge and drops to the ground, landing on its feet 1 and 1/2 seconds later. What is its speed on striking the ground?

• 5 m/s

• 10 m/s

• 15 m/s

• 20 m/s

Which of the following changes to motions causes acceleration?

• speeding up

• slowing down

• changing directions

• all of these