BEST PRACTICE: Accelerated Motion

The graph shows the velocity of a bicycle as the rider begins to move from a stop. What is the average acceleration of the bicycle in m/s²? Express the answer in 2 significant figures. No need to write the units.

The graph shows the velocity of a bicycle as the rider begins to move from a stop. What is the displacement of the bicycle between 0.00 s and 8.00 s?

• +48.0 m

• -48.0 m

• +24.0 m

• -24.0 m

A school bus's velocity decreases from 15 m/s to 5 m/s forwards over a period of 10 s. What is the bus's average acceleration?

• 1 m/s² forward

• 1 m/s² backward

• 2 m/s² forward

• 2 m/s² backward

If a race horse accelerates from rest at a constant rate of 3.5 m/s² north, how long (in seconds) will the horse take to reach a speed of 19 m/s? Express the answer in 2 significant figures. No need to write the unit.

A bucket of paint falls from a ladder onto the sidewalk below. If the bucket falls for 0.95 s, what is its velocity just before it hits the sidewalk?

• 4.4 m/s down

• 8.9 m/s down

• 9.5 m/s down

• 10 m/s down

Which graph might show the velocity of a ball that is thrown straight up from the ground into the air and allowed to fall freely back to the ground? (Consider up to be the positive direction.)

• 
• 
• 
• 

A physics student drops a well-wrapped egg off the top of the school roof. If the roof is 4.0 m above the ground, what is the egg's speed (in m/s) just before that egg hits the ground? Express the answer in 2 significant figures, no need to write the units.

The graphs show the motion of four cars, A, B, C, and D. Arrange the cars from lowest to highest final velocities.

• A, B, C, D

• D, C, B, A

• B, C, D, A

• D, C = B, A

The graphs show the motion of four cars, A, B, C, and D. Arrange the cars from highest to lowest average acceleration.

• A, B, C, D

• D, C, B, A

• B, C, D, A

• D, C = B, A

The graph shows the motion of a farmer’s truck. What is the truck’s total displacement? Assume that north is the positive direction.

• 150 m south

• 125 m north

• 300 m north

• 600 m south